帮忙选一下答案：是 E 吗？

6.  In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.

A. most of them as large or larger than Jupiter, which circle

B. most of them as large or larger than Jupiter and circling

C. most of them at least as large as Jupiter, circling

D. mostly at least as large as Jupiter, which circle

E. mostly as large or larger than Jupiter, circling

我也觉得选E,因为them 指代不清,而D,E中D改变了原意,故排除.