In the following sentence, some part may have an error. Identify the part that contains an error. If there is no error, select "No error". "The officer asked the recruit (A) / which district (B) / he came from. (C) / No error (D)"

Introduction / Context:
Error detection questions evaluate how accurately you can spot grammatical or stylistic mistakes in a sentence that has been split into labelled parts. In this question, a reported speech sentence is divided into four segments. Your task is to find which segment, if any, violates standard English usage. Such questions are common in competitive exams because they test attention to detail and understanding of subtle grammar points, such as the correct placement of prepositions in relative and interrogative clauses.

Given Data / Assumptions:

• The sentence is: "The officer asked the recruit (A) / which district (B) / he came from. (C) / No error (D)".
• Part A: "The officer asked the recruit"
• Part B: "which district"
• Part C: "he came from."
• Part D: "No error"
• We assume a formal written English standard, such as that used in examination papers and official communication.

Concept / Approach:
In informal English, ending a clause with a preposition, as in "Which district he came from", is often accepted in speech. However, in formal written English and many exam settings, this structure is considered less correct, and the preposition is normally placed before the relative or interrogative pronoun. Thus, "from which district he came" is preferred. Parts A and B are structurally sound, while part C "he came from" places the preposition at the end. Therefore, part C contains the error under strict exam standards.

Step-by-Step Solution:
Step 1: Check part A: "The officer asked the recruit". This is correct: subject "The officer", verb "asked", object "the recruit".Step 2: Check part B: "which district". This correctly introduces an indirect question about place: "which district".Step 3: Combine parts A and B: "The officer asked the recruit which district ..." is a natural beginning for an indirect question.Step 4: Check part C: "he came from." In conversational English, "which district he came from" is commonly used, but in formal English, the preposition "from" should not be stranded at the end.Step 5: The more formal and exam friendly version is "from which district he came". So part C is better written as "from which he came".Step 6: Since parts A and B are fine and the issue lies in part C, the error is in segment C.

Verification / Alternative check:
Rewrite the entire sentence in a more formal style: "The officer asked the recruit from which district he came." This sentence avoids ending the clause with a preposition and is stylistically preferred in formal contexts. Now match the corrected sentence with the original parts. You will see that only part C changes from "he came from" to "from which he came". Parts A and B remain unchanged. Therefore, the error must be associated with part C, confirming option C as the correct choice.

Why Other Options Are Wrong:

• Part A: "The officer asked the recruit" is grammatically sound, with correct subject, verb and object.
• Part B: "which district" correctly introduces the content of the question and does not contain an error.
• Part D: "No error" cannot be correct because we have identified a clear stylistic and grammatical problem in part C.
• Option E: "None" is unnecessary since an explicit "No error" option is already provided and is not correct here.

Common Pitfalls:
Many learners are used to everyday spoken English, where ending a sentence with a preposition ("he came from") is common and acceptable. As a result, they may not notice this as an error in exam style questions that expect more formal structures. Another pitfall is to mark "No error" simply because the sentence seems understandable. In examinations, you must consider the standards of formal written English. When you see prepositions at the end of clauses in indirect questions or relative clauses, it is often a clue to look more closely for possible corrections such as "from which he came".

Final Answer:
The segment that contains the error is Part C, so the correct option is C.