[求助]一道组合管理题，谢谢。 following, between, stocks, return

hariRaj

不知道怎样做，请解答详细一点，感谢
An analyst makes tihe following estimates:


Rate of return
ScenarioProbabilityStock FStock G
10.50.30.2
20.50.1-0.1

Based on the date gicen above,the covariance between tehe rates of return on stocks F and G is:
A. -0.0163   B.0.0500   C. 0.0150   D. 0.2000