What is a stock index? a. The average change in a stock's price over a given period. b. An indicator of market strength based on the prices of several specific stocks. c. A listing of all stocks available in a specific market. d. The current number of stocks in your portfolio.

The answer is B. It is also called as the stock market index, it is an estimation of the value of a section of the share trading system. It is processed from the costs of chose stocks. It is an instrument utilized by speculators and money related chiefs to portray the market and to think about the arrival on particular ventures.