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Bunuel
When automatic teller machines were first installed in the 1980s, bank officials promised they would be faster, more reliable, and less prone to make errors than their human counterparts.


(A) they would be faster, more reliable, and less prone to make errors

(B) they would be faster, more reliable, and that they would be less prone for making errors

(C) the machines would be faster, more reliable, and less prone to make errors

(D) the machines were faster, more reliable, and errors would occur much less

(E) faster, more reliable machines, and that errors would be less prone





OFFICIAL EXPLANATION



C

Go through your checklist of potential errors. Is there a misplaced modifier here? No. Is there a pronoun problem? Well, wait a minute. There certainly is a pronoun here. Is it possible that the “they” could be ambiguous? As a matter of fact, “they” is obviously supposed to refer to the automatic teller machines, but it also could refer to the bank officials. Replacing “they” with “the machines” clarifies the sentence, which means we are down to C, D, or E, but C has a much more parallel construction.
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