A new hair-growing drug is being sold for three times the price, per milligram, as the drug’s maker charges for another product with the same active ingredient.
A. as
B. than
C. that
D. of what
E. at which
我想选a
as 作为‘原因’解释，我觉得很合适阿
per milligram是插入语，把它去掉再看看：
3 times the price that the druger's maker charges是对的， 而3 times the price as the druger's make charges就不对了。
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