Answer:
D. Securities and Exchange Commission
Step-by-step explanation:
-Federal Deposit Insurance Corporation is an agency that provides insurance for people and organizations that deposit money in the financial institutions in the U.S.
-Social Security Administration is an agency of the US government that manages the disability, survivor and retirement programs.
-US Treasury Department is in charge of managing the government finances.
-Securities and Exchange Commission is an agency that controls the security's industry in the US where the stocks transactions occur.
According to this, the answer is that the financial institution that is in charge of monitoring the stock market today is the Securities and Exchange Commission.