Security screening lines at Hartsfield-Jackson Atlanta International airport are often long. The average time a passenger spends in these lines during the peak time is about 15 minutes, and follows an exponential distribution. What is the probability it will take less than 20 minutes for a passenger to pass through security screening line during the peak time?
A. 0.491
B. 0.658
C. 0.736
D. 0.812