What Is a Stock's Book Value

What is a stock's book value?

A) the current price of a share of stock in the stock market
B) the average price of one share of stock over the past year
C) the face value of a share of stock, set by the issuing company's board of directors
D) the value expressed as total stockholders' equity divided by the total number of shares of stock issued
E) the value expressed by the number of stock shares issued by the board of directors