Answer:
B. It overturned the gold standard.
Step-by-step explanation:
The Coinage Act of 1873 was a general revision of the laws relating to the Mint of the United States. It ended bimetallism, placing the nation behind the gold standard.
Before that, the silver was more expensive than the gold causing the gold standard to be endangered. Mostly because little silver was presented at the Mint. When silver prices dropped out in 1876 producers wanted to sell their silver at the Mint but they found out that it was impossible.
The matter became a major political controversy that lasted until the end of the century.
I hope this answer helps you.