The purpose of the SEC's circuit breakers rule is to: a. allow floor traders to specialize in trading the securities of specific industries. b. halt trading for a short time following a dramatic drop in stock prices. c. prevent market disruption caused by a communication malfunction. d. prevent individuals from profiting from information not available to the general public.

The correct answer is letter "B": halt trading for a short time following a dramatic drop in stock prices.

Explanation:

A Circuit Breaker is a measure taken during large stock exchange sell-offs to avoid panic selling. They usually involve a trading pause or the establishment of restrictions when an index falls by a certain percentage. They give investors a chance to calm down and evaluate their options.