Question

what scenario would most likely cause the sec to activate its protective measures?
a natural disaster resulting in the displacement of american communities
the bankruptcy of a major bank resulting in an economic drop
an airport incident resulting in the delay of major international flights

Explanation:

The SEC (Securities and Exchange Commission) focuses on the securities - market and financial stability. A major - bank bankruptcy causing an economic drop can have significant impacts on the securities market, which would likely prompt the SEC to take protective measures. Natural disasters and airport incidents are not directly related to the SEC's area of responsibility.

Answer:

the bankruptcy of a major bank resulting in an economic drop