one question please answer quickly

30. Westover stock is expected to return 36 percent in a boom, 14 percent in a normal economy, and lose 75 percent in a recession. The probabilities of a boom, normal economy, and a recession are 2 percent, 93 percent, and 5 percent, respectively. What is the standard deviation of the returns on this stock? A. 45.90 percent B. 32.52 percent C. 10.40 percent D. 5.80 percent E. 19.74 percent