Need correct answer. I will rate accordingly with multiple votes...,.,.,.,.

Shares of company A are sold at $20 per share. Shares of company B are sold at $50 per share. According to a market analyst, company A's expected return is $1 per share with a standard deviation of $0.5. And company B's expected return is $2.50 per share with a standard deviation of $1. In order to maximize the expected return and minimize the risk (standard deviation or variance), which of the following investment is better (1) 100 shares of A (2) 50 shares of A and 20 shares of B (3) 40 shares of B