orbit of Jupiter

GmatKiss wrote:Although just inside the orbit of Jupiter, amateur astronomers with good telescopes should be able to see the comet within the next few weeks.

(A) Although just inside the orbit of
(B) Although it is just inside the orbit of
(C) Just inside the orbit of
(D) Orbiting just inside
(E) Having orbited just inside

OA is B
[spoiler]I thought "it" is likely to refer "amateur astronomers" and hence eliminated B![/spoiler]
Please help me understand this question!

VivianKerr wrote:I can see how you got confused, but "it" is singular and "astronomers" is plural, so "it" must logically modify "comet," especially because in terms of meaning the only thing that is logically "inside the orbit of Jupiter" is the "comet."

A, C, D, and E all make it seem like the astronomers are inside Jupiter's orbit! To understand the question, you have to look at the meaning.