If n is the product of the integers from 1 to 20 inclusive, what is the greatest integer k for which 2^k is a factor of n?
A. 10
B. 12
C. 15
D. 18
E. 20
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请问陆旭老师,这个图片是网络明星课学生教材37页的第二个qx,我能排除abd,可以说一下c对比e吗?似乎我感觉e这么说可以和conclude that前面平行,但是不平行是不是更简洁,c有什么硬伤吗?之前网上资料说,逗号加连词之后要补出主语they,不过您上课说,这也不一定,还给了个反例,记得好像是after several years of rapid growth, the health care.....那个题e选项,所以我有点困惑