Identify the part of the sentence that contains a grammatical error.
A. The reason for his failure B. is because he C. didn't study D. for the exam.
Show answer & explanation
Correct answer: B
Explanation
The phrase "The reason for his failure" already implies a cause. Using "because" after "is" is redundant and creates a grammatical error. The correct sentence would be:
The reason for his failure is that he didn't study for the exam.