Which of the Following Statements Correctly Identifies a Difference Between

Which of the following statements correctly identifies a difference between a stock exchange and a stock index?

A) A stock exchange refers to a market where stocks of government-owned enterprises are traded, while a stock index refers to a market where the stocks of privately-owned enterprises are traded.
B) A stock index refers to a market where stocks of government-owned enterprises are traded, while a stock exchange refers to a market where the stocks of privately-owned enterprises are traded.
C) A stock exchange refers to a market where stocks are traded, while a stock index reflects the average price of a collection of stocks.
D) A stock index refers to a market where stocks are traded, while a stock exchange reflects the average price of a collection of stocks.