Based on current dividend yields and expected capital gains, the expected rates of return on portfolios

A and $B$ are $12\%$ and $16\%,$ respectively. The beta of $A$ is $0\mathrm{.}7,$ while that of $B$ is $1\mathrm{.}4.$ The T$-$bill rate is currently $5\%,$

whereas the expected rate of return of the S&P $500$ index is $13\%.$ The standard deviation of portfolio $A$ is $12\%$ annually,

that of $B$ is $31\%,$ and that of the S&P $500$ index is $18\%.$

Calculate the alphas for the two portfolios. $($Round your answers to $1$ decimal place.$)$

If you could invest only in T$-$bills and one of these portfolios, which would you choose?