You can look at the words in front and behind it, because they refer to this big word. You may find a synonym of the word or a close reference. So for example in this sentence: I was excited and ambitious to learn about cars today. So this is a easy example. You can use exited to define ambitious if you dont know what ambitious means.
Answer:
(D) Although she was less successful after emigrating to New York when compared to
Explanation:
The word "although" is used to show that in spite of something happening, something was still done.
This is the best answer to the given sentence which states that although she was less successful after emigrating to New York compared to her native Germany, photographer Lotte Jacobi nevertheless earned a small group of discerning admirers
B is correct answer I guess ......