885 section 1 - 11

11.   Although the lesser cornstalk borer is widely distributed, control of them is necessary only in the South.

(A) the lesser cornstalk borer is widely distributed, control of them is

(B) widely distributed, measures to control the lesser cornstalk borer are

(C) widely distributed, lesser cornstalk borer control is

(D) the lesser cornstalk borer is widely distributed, measures to control it are（D）

(E) it is widely distributed, control of the lesser cornstalk borer is

Answer is D,我选的是C，这题实在看不太懂，请大大们帮个忙！！