Sentence Correction

The stars, some of them at tremendous speeds, are in
motion just as the planets are, yet being so far away
from Earth that their apparent positions in the sky do
not change enough for their movement to be observed
during a single human lifetime.
(A) The stars, some of them at tremendous speeds,
are in motion just as the planets are, yet being
(B) Like the planets, the stars are in motion, some
of them at tremendous speeds, but they are
(C) Although like the planets the stars are in motion,
some of them at tremendous speeds, yet
(D) As the planets, the stars are in motion, some of
them at tremendous speeds, but they are
(E) The stars are in motion like the planets, some of
which at tremendous speeds are in motion but

The OA is B and can be eaisly identified by POE.

My question is in B, they is a subjective pronoun and Them is an objective pronoun, and the subject of the sentence is The stars, so how can both They and Them refer to the stars.

Thanks,

Vineet

Vineet, request you not to put incorrect answer as OA. The thing is that I chose B at first but confused to see OA mentioned by you as C
OA is B
Anyway, when there is comparison, try to put both nouns in same place separating by comma(,) Now coming to your query, 'them' is used in modifying clause , referring to 'The Starts' and 'they' is used as 'Object' ,referring to 'The Starts'. Hope this helps.

IMO is B but just curious, is the antedcent for They in the sentence is clear?

I'd go with B also! I think the antecedent for THEY is "stars".

My Bad, I have fixed the OA.

Coming back to my question, I still don't get it why They and Them, both can refer to the stars although they are both in different cases.

Vineet