Hi Ron,
I have a question for you with regards to your explanation for why C is wrong. I picked A because I've seen similar question before... but I never quite get why C's construction is wrong.
Well, two problems with C, one which I actually get, the other, I don't.
1.) "They" stand for the whole package of "soaring television costs" So if let's replace They with the antecedent:
Soaring television costs accounted for more than half of the spending in the presidential election of 1992, a greater proportion than the SOARING TELEVISION COSTS have been in any previous election.
Therefore, it is nonsense... you are comparing Soaring Television Costs to another Soaring Televions Costs when you are really trying to compare cost to cost.
Cool - I got this part. YOu can't cherry-pick your pronouns.
2.) Ellipsis paralleism - This is the part I'm not as clear about. The pronoun problem aside, wouldn't it make sense to say:
Soaring television costs accounted for more than half of the spending in the presidential election of 1992, a greater proportion than they have been (accounting for) in any previous campaign.
Per your original suggestion, why is it that in the parenthesis you need "ACCOUNTING" vs "accounted for"? This makes no sense.
I would've eliminated C (in addition to the pronoun problem before) based on verb tense, not parallelism. It should have been "they had been accounted for" because the more recent television costs in 1992 are in past tense. If I changed the tense to past perfect, would Choice C be correct?
I really want to understand your ellipsis parallelism concept. I see this type of construction all the time when x than y comparison is used... can you perhaps provide a few illustrative, simple examples?
Thank you,
James