Sun and Hydrogen

vote for E

Can you please explain your answer choice?

i`ll try to say something
A) for sure wrong.like doesn`t work with verb, also wrong comparison:like x, y.....
also i don`t like tences here, it seems like the sun has already exhausted ...and is expanding, i think future tence is more valid here
B)again wrong comparison: like X,Y. X and Y must be as close as possible. it better to compare Star with another star or with the sun, but not star with hydrogen
once and then together are excessive
also B says that hydrogen expands into a red giant, but it must be sun`core that expads
C)again hydrogen expands into a red giant, must be sun
and also i am not sure that we can employ construction:as in the case .....with out verb, to me as is (was)(will) in the case.... is better
D)hydrogen expands.....,
so left with E

E is correct.

(A) Like any star of similar mass would do, once the Sun has exhausted the hydrogen in its core, it expands into a red giant, eventually ejecting

(B) Like any star of similar mass, once the hydrogen in the Sun's core is exhausted, then it expands into a red giant and eventually ejects

(C) As in the case of any star of similar mass, once the hydrogen in the Sun's core is exhausted, it will expand into a red giant, and eventually ejecting

(D) As any star of similar mass would, once the hydrogen in the Sun's core is exhausted it will expand into a red giant and will eventually eject

(E) As would be the case with any star of similar mass, once the Sun exhausts the hydrogen in its core, it will expand into a red giant and eventually eject

OA is E

I do not know how to use "as in the case of..." and " as would be the case..."

pls, explain, is there ellipsis problem here

"as in the case" means

"as the sun expand in the case of similar mass star"

pls, help