28) A firm has the NPV of a project based on three possible economic conditions and their probabilities given below. The expected NPV is $59.2 million. What is the standard deviation for the project's NPV?

Economic Condition	Probability of outcome	NPV ($ million)
Recession	.10	22
Boom	.60	74
No change	.30	42

A) 18.94

B) 17.42

C) 20.64

D) 17.24

E) 19.89