Directions: The following sentence has been broken into three parts (A), (B) and (C). If there is any grammatical error in any of these parts, that is the answer. If there is no error, the answer is (D).

During their morning walk, (A)/ these boys like to walk, talk (B)/ and to do exercise. (C)/ No error (D)

This is the correct option as this part of the sentence has the error. This part violates the rule of parallelism. The infinitive ‘to’ should be placed before the first element and should not be repated after that. Second best is to repeat it before all the elements. Since, the infinitive 'to' is given before the first and not repeated before the second, we will remove the 'to' in the third part of the sentence too.