Q30:

Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient

power in fuel cells and batteries, a permanently orbiting space station will have to

generate its own electricity.

A.  the short flights of the shuttle and earlier spacecraft, which carried sufficient

power in fuel cells and batteries

B.  the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and

batteries for their short flights

C.  the short flights of the shuttle and earlier spacecraft, which enabled them to carry

sufficient enough power in fuel cells and batteries

D.  the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights

E.  the flights of the shuttle and earlier spacecraft, whose shortness allowed them to

carry sufficient power in fuel cells and batteries

   Answer:  D

请问B选项的错误在哪里？谢谢！