The correct answer
is: D. No errorThe sentence “Azharuddin is one of the finest batsmen that India have produced over the decades” is grammatically correct. The verb “have produced” agrees with the subject “India”, which is a plural noun. The prepositional phrase “over the decades” modifies the verb “have produced” and indicates that Azharuddin is one of the finest batsmen that India has produced over a long period of time.
The other options are incorrect because they contain grammatical errors. Option A is incorrect because the verb “is” does not agree with the subject “Azharuddin”, which is a singular noun. Option B is incorrect because the preposition “that” is not necessary in this sentence. Option C is incorrect because the prepositional phrase “over the decades” is not necessary in this sentence.