1998 saw several new ventures promoting online distance learning both at the college and graduate level, but also faculty members in large numbers began questioning whether the computer screen was an adequate replacement for the classroom.
Before we delve deeper, just check the correlative conjunction parallelism alone
Correct Parallelism is both---and
(A) Both at the college and graduate level, ---
both at and graduate level is wrong; the ‘at’ is missing in the second arm. (B both college and for graduate-level courses, --
both college and for graduate is wrong—for is unnecessary (C) both for college and graduate courses in 1998, --- b
oth for and graduate is wrong – for is unnecessary (D) both college and graduate-level courses ---
correct
(E) both the college level as well as the graduate, ---
both the college level as well as the graduate level is wrong It should be simply both… and.