Question from 1000SC

[veebhor]

[Deleted because this question is from a banned source - see below.]

[thanigs]

B.

Option A has MM.

So Although it refers correctly to Comet instead of astronomers and so B is the answer.

[RB_51273]

It should be C.
Although is used mainly to show contrast,

D and E changes the meaning(inside the Jupiter)

[Ben Ku]

1000SC is a banned source because it illegally uses copyrighted problems without permission. (And, even if it didn't, we'd ban it anyway - a lot of the problems in the set are fine, but there are a number of bad ones that can actually mess up your study if you use them!)