15. It can reasonably be inferred from the passage that at the time ER began working for social reform, the United States was:
Your Answer is
Correct Answer is D
Explanation
According to the social reforms of the question stem, you can locate the fifth paragraph. According to "at the margins of national politics", we can know that the content of the social reform that ER initially promoted was not supported by the government at that time. ABC is not mentioned in the text, so wrong.