49. The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus, which doubles to twelve the number of satellites now known as orbiting the distant planet.

(A) which doubles to twelve the number of satellites now known as orbiting

(B) doubling to twelve the number of satellites now known to orbit

(C) which doubles to twelve the number of satellites now known in orbit around

(D) doubling to twelve the number of satellites now known as orbiting（B）

(E) which doubles to twelve the number of satellites now known that orbit

I can't understand what does OG mean in the sentence"Also in E, the use of the phrasing the number... now known that orbit is ungrammatical and unclear. "

Thanks!

In point of fact, the flaw in E is very typical in SC quiz.

You can even consider something known/believed/thought/... that(clause) an error paradigm.

And, when you observe the that in E, you gonna find the that is cumbersome: know(n) needs only one objective, either satellites or that.