The Dow-Jones Industrial Average Is the Best-Known Measure of the Performance

The Dow-Jones Industrial Average is the best-known measure of the performance of the U.S.stock market,and is an average of the stock prices of

A) the 500 largest corporations in the United States.
B) 30 large corporations.
C) over 3,200 high-tech stocks.
D) all major banking and financial companies.