Identify the part (A–E) that contains a grammatical error in the sentence below. If there is no error, choose option E (No error). Sentence (split into parts): A) From a tiny roon in B) the slums, they have C) managed to move to a good D) house in a better locality.

Introduction:
This item checks spelling and lexical accuracy that affects grammatical correctness of the sentence.

Given Data / Assumptions:

• Phrase in A contains "roon".
• Intended word is "room".
• Remainder of the sentence is structurally sound.

Concept / Approach:
Spelling errors that change a word into a non-word or a different word class are treated as errors. The standard phrase is "a tiny room".

Step-by-Step Solution:
1) Identify anomaly: "roon".2) Correct to "room".3) Entire sentence after correction: "From a tiny room in the slums, they have managed to move to a good house in a better locality."

Verification / Alternative check:
All other parts—prepositions, articles, and verb forms—are correct.

Why Other Options Are Wrong:
B: Correct comma after introductory prepositional phrase.C: Grammatically fine.D: Noun phrase with comparative "better" is acceptable.

Common Pitfalls:
Overlooking typographical errors when focusing only on grammar.

Final Answer:
A (Correct "roon" to "room")