求助这一题的正确答案：
According to a 1996 study published in the Journal of Human Resources. Americans of Middle Eastern descent were twice as likely __as was the national average to be self-employed.
A. as was the national average to be self-employed
B.as the average American to be self-employed
C.as the national average that the would be self-employed
D.to be self-employed than was the average American
E.that they would be self-employed than was the national average
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