Error Spotting – Choose the part (A–D) that contains a grammatical error, or choose No error if the sentence is fully correct. Sentence (parts correspond to options below): A) We fail to understand B) why do most educated people C) lose their temper even D) without any apparent reason.

Introduction / Context:
This question targets indirect questions and word order. After a reporting clause like we fail to understand, an embedded wh-clause takes statement order, not question order.

Given Data / Assumptions:

• Main reporting clause: We fail to understand
• Embedded wh-clause beginning with why
• Auxiliary do is present in the embedded clause

Concept / Approach:
Direct question: Why do people lose their temper? Embedded statement: We fail to understand why people lose their temper. In the embedded version, do-support and subject–auxiliary inversion are not used.

Step-by-Step Solution:

Verification / Alternative check:
Paraphrase: We cannot understand the reason that most educated people lose their temper. The absence of inversion confirms the rule.

Why Other Options Are Wrong:

• A) Main clause is grammatical and idiomatic.
• C) Verb phrase lose their temper is standard.
• D) Prepositional phrase without any apparent reason is idiomatic.

Common Pitfalls:
Writers often copy the word order of a direct question into an embedded clause. Remember: no inversion after wh-word when the clause is embedded.

Final Answer:
Option B contains the error. Use why most educated people lose ...