Companies are relying more

[BTGmoderatorDC]

Companies are relying more and more on networked computers for such critical tasks as inventory management, electronic funds transfer, and electronic data interchange, in which standard business transactions are handled via computer rather than on paper.

A. in which standard business transactions are handled via computer rather than on paper
B. where computers handle standard business transactions rather than on paper
C. in which computers handle standard business transactions instead of on paper
D. where standard business transactions are handled, not with paper, but instead via computer
E. in which standard business transactions are being handled via computer, in place of on paper

In what sentence rule did Option C the correct answer? Need experts advice on this

OA A

[ErikaPrepScholar]

C is a parallelism issue. Whenever we are comparing two things (using words like "rather" or "instead"), they need to have the same grammatical structure.

In the correct answer, A, we have the comparison "handled via computer rather than on paper". The structure of both is preposition + noun.

C tells us that "computers handle standard business transactions instead of on paper". This isn't parallel - the second thing in the list has a preposition, while the first thing doesn't. We can eliminate C.