If a supply chain is described by the following probabilities:
P(State of Economy: Boom) = 0.40
P(Stock A) = 0.11
P(Stock B) = 0.20
P(Stock C) = 0.21
P(State of Economy: Bust) = 0.60
P(Stock A) = 0.12

What is the probability of Stock C in a bust economy?

a) 0.21
b) 0.20
c) 0.60
d) 0.12