You own a portfolio which is invested equally in two stocks and a risk-free security. The stock betas are .89 for Stock A and 1.26 for Stock B. Which one of the following will increase the portfolio beta, all else constant?

increasing the amount invested in the risk-free security

decreasing the weight of Stock B and increasing the weight of Stock A

replacing Stock A with a security that has a beta of .77

increasing the weight of Stock A and decreasing the weight of the risk-free security

replacing Stock B with Stock C, which has a beta equal to that of the market