* HELP PLEASE --> A painkiller drug......

[ricms08]

A painkiller drug is being sold for three times the price, per milligram, as the
drug’s maker charges for another product with the same ingredients.

A. as
B. than
C. that
D. of what
E. at which

I´m not sure if the answer is C or D.

What grammar rule is used in this case?

thanks

[abhishekit]

I would say C.

being sold for three times the price that the drug's maker charges for another product.

'of what' comes close but it makes it a bit awkward.

being sold for three times the price of what the drug's maker charges for another product.

but the drug's maker is charging a price. So this is like saying

three times the price 'of the price'

[jayachandran.b]

shouldn't it be B??

A painkiller drug is being sold for three times the price than the
drug’s maker charges for another product with the same ingredients.

[Ben Ku]

Please cite the source (author) of this problem. We cannot reply unless a source is cited (and, if no source is cited, we will have to delete the post!). Thanks.

[ritesh.bindal]

I saw this question on GPREP.

[RonPurewal]

a-new-hair-growth-drug-is-being-t5504.html