Which One of the Following Is Least Apt to Reduce

Multiple Choice

Which one of the following is least apt to reduce the unsystematic risk of a portfolio?

A) reducing the number of stocks held in the portfolio
B) adding bonds to a stock portfolio
C) adding international securities into a portfolio of U.S. stocks
D) adding U.S. Treasury bills to a risky portfolio
E) adding technology stocks to a portfolio of industrial stocks