Which of the Following Is True of Stocks

Which of the following is true of stocks?

A) It refers to a loan from the investor to a company or government entity.
B) It refers to the simultaneous and instantaneous purchase and sale of a currency for a profit.
C) It refers to the practice of buying and selling a currency with the expectation that the value will change and result in a profit.
D) It refers to a type of equity security that gives the holder an ownership of a company's assets and earnings.
E) It refers to the technique of protecting against the potential losses that result from adverse changes in exchange rates.