Read the sentence carefully to identify if there is any grammatical or idiomatic error in one part of the sentence. The error, if present, will be in only one part. Choose the number of that part as your answer. If there is no error, select option (e).

Sentence:

(a) After forty years of trying to / (b) understand why asbestos causes cancer, / (c) researchers have finally / (d) unraveled the mystery. / (e) No error

Question

Read the sentence carefully to identify if there is any grammatical or idiomatic error in one part of the sentence. The error, if present, will be in only one part. Choose the number of that part as your answer. If there is no error, select option (e).

Sentence:

(a) After forty years of trying to / (b) understand why asbestos causes cancer, / (c) researchers have finally / (d) unraveled the mystery. / (e) No error

Accepted Answer

**Solution:**

1. Analyze each part of the sentence for grammatical or idiomatic errors:

- (a) "After forty years of trying to" is correct as it properly introduces the duration and the action.

- (b) "understand why asbestos causes cancer," is grammatically sound and idiomatic.

- (c) "researchers have finally" is correctly structured with the subject and auxiliary verb.

- (d) "unraveled the mystery." is appropriate and correctly used.

2. Since all parts are grammatically and idiomatically correct, there is no error in the sentence.

**Answer:** (e) No error

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