(A) in healing physical and mental ills or thanking her for such help
(B) in healing physical and mental ills and to thank her for helping
(C) in healing physical and mental ills, and thanking her for helping
(D) to heal physical and mental ills or to thank her for such help
(E) to heal physical and mental ills or thanking her for such help
Solution:
Parallelism + Idiom
Asking in healing or thanking for is parallel and idiomatically correct.
Hence, A is the best choice.
Sentence Correction - 1000 Questions with Solution: