which of the following statement is true?

a. If you stock in a snow sled company and went to reduce risk through diversification, you should add shares of stock from a snow boots company rather than from a sunscreen company.

b. the best measure to use when comparing alternative investment is their annualized holding period returns.

c. the benefit from diversification is positively related to the correlation coefficient.

d. As you add stocks from different companies, we would expect total risk to go down because of a reduction systematic risk.