Hello. You did not provide the excerpt to which this question refers and did not enter answer options, which makes it impossible for me to answer your question.
However, to find out which of the answer options show the main claim of the passage first, you must read the entire passage and understand what the main topic being discussed is. The theme is the main claim of the passage and among the answer options, the one that represents this theme is the sentence that answers your question.
I hope it helped you.