IMO B

A) Eliminated due to HAD; as the sentence does not imply any sequence
C) The discussion is of 1890's and hence no need for future tense
D) Eliminated due to HAD
E) Eliminated due to WILL HAD

Many athletes develop poor fundamentals when trying to compensate from an injury, but they can correct these fundamentals with hard work and dedication.

(A) but they can correct these fundamentals
(B) but are correctable
(C) but they can correct them
(D) which can be corrected
(E) but these fundamentals can be corrected


The correct answer without any doubt is A.

C looked closer to me, but it is not. There is some pronoun ambiguity present in the option C.

Option E is eliminated due to passive construction.