Gwd-12-39

Q39:

Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less, get better gas mileage, allow passengers to get in and out more easily, and have a smoother ride.

A.     Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less,

B.     Minivans, which carry as many as seven passengers, compared with most sport utility vehicles, they cost less,

C.     Minivans carry as many as seven passengers, in comparison with most sport utility vehicles, and have a lower cost, they

D.     Minivans, carrying as many as seven passengers, compared with most sport utility vehicles, cost less,

E.      Minivans, which carry as many as seven passengers, compared with most sport utility vehicles the cost is lower, and they

我选了D但答案是B，不明白D错在哪里，B里minivans和they不重复吗？