Question

The CTC vaccine greatly helped in increasing vaccination coverage in a few areas where excess was a problem and electricity was unreliable.

Read each sentence to find out whether there is any error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark "No Error" as your answer. (Ignore the errors of punctuation).
A The CTC vaccine greatly helped in increasing
B vaccination coverage in a few areas
C where excess was a problem
D and electricity was unreliable
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