Let A be the event that a flight from New York to San Francisco arrives on time and let B be the event that it is a clear day in San Francisco. Suppose the probability of a clear day is ()=0.6P(B)=0.6. We also know that the probability a plane arrives on time on a clear day is (|)=0.9P(A|B)=0.9, and on a cloudy day it is (|)=0.5P(A|BC)=0.5.

A. 0.26

B. 0.6

C. 0.4

D. 0.74