Why is the volatility of the Market less than the volatility of any individual equity investments within the portfolio in the prior question ?

Group of answer choices:

1- The more stocks the investor puts into her portfolio, the more sensitive the portfolio

2- The volatility of the market can never be less than that of an individual security

3- none of the above

4- The more stocks an investor puts into her portfolio, the more likely that price changes in one stock in any given direction will be offset by an opposite-direction price change of another stock.

5- The more stocks added to a portfolio, the less likely an investor will have included over or under priced stocks.