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I selected D because of the comparison: According to the National Science Foundation, in2003 there were 198, 113 female science and engineering graduate students, almost 42% of the graduate students in those fields, almost 42% of the graduate students in those fields, double what it was in 1981
no other answer choice follows this comparison. so why is D wrong then and C right without the "in"?
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Could it be because the option lacks of next to double: "double of what it was....