[求助]885－12－25

25.   The record of the past is always incomplete, and the historian who writes about it inevitably reflects the preoccupations of their own time.

(A) the historian who writes about it inevitably reflects

(B) the historian writing about it will inevitably reflect

(C) a historian writing about it inevitably reflects

(D) writing about it, it is inevitable for historians to reflect（E）

(E) historians in writing about it inevitably reflect

答案E，why not  D? historians why plural?