Although just inside the orbit of Jupiter

[simplyjat]

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 B

[manasnanu]

The answer should be B. B inserts the subject " it" which the verb refers to in the second part.[/spoiler]

[zacharyz]

Yes - answer B is the only answer that does not imply the astronomers are orbiting or located near the orbit, etc. The use of 'it' can only refer to the comet, which is the object whose location you are referring to.

[himadeepm]

but, is it possible to use pronoun even before the corresponding noun is used