For Our Historical Comparison Purposes,how Are Large-Company Stocks Defined

For our historical comparison purposes,how are large-company stocks defined?

A) Stocks of the lowest 20 percent of the firms listed on the NYSE based on market capitalization
B) Stocks with average annual returns that exceed the average annual return of the U.S.Treasury bill
C) Any firm that has been listed on the NYSE for 40 years or more
D) Stocks of firms included in the S&P 500 composite index
E) Stocks of firms that employ over 5,000 employees