单选题 An analyst does research about Bayes' formula and estimates the following information regarding bonus for management and the net income of a company:

Event	Probability
Net income increases given management received a bonus	0.7
Net income mcreases given management did not receive a bonus	0.3

The analyst's prior probability that management received a bonus is 0.5. Using Bayes' formula, if the company announces an increase in net income, the probability management received a bonus is closest to:
A. 0.22
B. 0.78
C. 0.86