介词后面不是不可以加句子吗？

Astronomers studying the newly discovered star say that it provides clues about our galaxy’s origin, that it may supply data about how fast our galaxy is expanding, and moreover it is perhaps the most distant star in the entire Milky Way.

(A) about how fast our galaxy is expanding, and moreover it is perhaps

(B) regarding the speed our galaxy expands at; moreover, they think it may be

(C) about how fast our galaxy expands and perhaps be

(D) on the galaxy’s expansion rate and perhaps（E）

(E) about how fast our galaxy is expanding, and that it is perhaps

谁教教我~？

how fast our galaxy is expanding,这里是宾语从句 不是句子