Was stuck between C and D!
D does not have verb for the first clause, Hence C
A. heavilyaccounts for almost half of the $20.8 billion increase in drug spending last year, the remainder of which came
B. heavily were what accounted for almost half of the $20.8 billion increase in drug spending last year; the remainder of the increase coming- Missing Verb
C. heavily accounted for almost half of the $20.8 billion increase in drug spending last year, the remainder of the increase coming - CORRECT
...
D does not have verb for the first clause, Hence C
A. heavilyaccounts for almost half of the $20.8 billion increase in drug spending last year, the remainder of which came
B. heavily were what accounted for almost half of the $20.8 billion increase in drug spending last year; the remainder of the increase coming- Missing Verb
C. heavily accounted for almost half of the $20.8 billion increase in drug spending last year, the remainder of the increase coming - CORRECT
...
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