In the Champagne region of France, wine growers still harvest grapes as they have done for centuries, by carefully handpicking their crop and storing their precious fruit in specially aged casks.

Concepts tested:-
1) S-V agreement
2) Pronoun
3) Tense

1) wine growers- Subject in plural form. Hence the corresponding verb form must be used. Wine growers----> Harvest
2) Pronoun "they" must refer to corresponding antecedent in plural form. They---->Wine growers
3) Harvesting of grapes started in past and continues till the time of speaking.(Refer the keywords "for centuries" & "Still" ). Hence present perfect must be used. "They have done"

Therefore the original sentence needs zero corrections.

Ans. (A)
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Option A : Correct.

Option B : This phrase talks about one person (singular) while rest of the sentence talks about an entire community. Hence, incorrect.

Option C : 'wine growers still harvest' suggests of an action which is still going on since some time in the past, while, 'was done' refers to an action already finished. This makes the option less feasible as a correct answer.

Option D : 'wine growers still harvest' suggests of an action which is still going on since some time in the past, while, 'has been done' also refers to an action just finished. But the catch here is that the active voice from 'wine growers still harvest' changes to passive voice,'has been done'. This again undermines the clarity of the sentence.

Option E : 'wine growers still harvest' suggests of an action which is still going on since some time in the past, while, 'did' refers to an action which is finished. So, wrong formation.