In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
Please note that you will be eligible for (1)/ the voucher only if you (2)/ had received this email. (3)/ No Error (4)

Correct option is C

The error is in part (3) of the sentence. The phrase "had received" is incorrect in this context. The conditional sentence uses "will be" in the main clause, so the subordinate clause should use the present perfect ("have received") instead of past perfect ("had received").
Correct sentence:
"Please note that you will be eligible for the voucher only if you have received this email."