Hey!! I believe that the answer is D. Ethnic and religious diversity!!
The Titanic sank because it hit an iceberg, there was poor visibility the night it happened.
Answer: The support of the voting rights had increased.
Explanation: ...
The answer is a.
The Populist Party was originally formed by farmers in response to the growing threat big companies had on them. So that rules out b through d.
If you want me to give you a more detailed explanation of the Populist Party, let me know because I just had a final on this in college. :)