Most of the country’s biggest daily newspaper had lower circulation in the six months from October 1995 through March 1996 than a similar period a year earlier.
(A) a similar period
(B) a similar period’s
(C) in a similar period
(D) that in a similar period
(E) that of a similar period
我对这道题目的理解是in the six months作状语,所以选C,不知道我的理解对不对~