I just need help with B and C and if you could show me how to work it that would be awesome

Consider the following table, which gives a security analyst's expected return on two stocks and the market index in two scenarios: a. What is the expected rate of return on each stock? (0.2pts) b. Compute the variances for the two stocks and the market index.(0.5pts) c. Compute the covariances. (three covariances) (0.5pts)