She was less successful after she had emigrated to New York compared to her native Germany, photographer Lotte Jacobi nevertheless earned a small group of discerning admirers, and her photographs were eventually exhibited in prestigious galleries across the United States.
(A) She was less successful after she had emigrated to New York compared to
Less successful “than” is missing.
What is being compared to what?
She was less successful than she had been (successful) in Germany
Two independent clauses connected by a comma makes it a run-on sentence
Incorrect comparison. Eliminate.
(B) Being less successful after she had emigrated to New York as compared to
Same as A.
(C) Less successful after she emigrated to New York than she had been in
Correct.
(D) Although she was less successful after emigrating to New York when compared to
Same as A and B. Incorrect comparison. Eliminate.
(E) She had been less successful after emigrating to New York than in
Same as A.
The past perfect tense is incorrectly used
Two independent clauses connected by a comma makes it a run-on sentence
Eliminate.