Rudy is a risk-averse investor. He wants to reduce risk as much as possible in the stock market. If you are his financial advisor, you would suggest him form a portfolio with two stocks that:

a)	their returns are the highest in the last year;
b)	their returns are the lowest in the last year;
c)	their correlation is 0.1;
d)	their correlation is 0.5;
e)	their correlation is 0.9;