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a. a greater proportion than it was
b. a greater proportion than
c. a greater proportion than they have been
d. which is greater than was so
e. which is greater that is has been
A. "it" is clear referent to spending
B. missing pronoun
C. pronoun disagreement. "they" and "spending" dont go together
D. which refers to the "presidential campaign"
E. which refers to the "presidential campaign" _________________
I'm crossing the bridge.........
a. a greater proportion than it was >refers to all spending, not just television costs b. a greater proportion than OK
c. a greater proportion than they have been >incorrect use of the pronoun
d. which is greater than was so >incorrect use of is
e. which is greater that is has been >incorrect use of is and has been
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than in any previous election.
There's nothing wrong here with official answer B. There is not a comparison problem. The phrase "a greater proportion" is modifying "half" . This is an eliptical construction (some words are assumed, not given explicitly).
Read it like this, and paraphrasing a tad for clarity:
... costs accounted for more than half the spending in the 1992 election, [which is] a greater proportion than [was spent] in any previous election.