306. An insurance company sells 40% of its renters policies to home renters and the remaining 60% to apartment renters. Among home renters, the time from policy purchase until policy cancellation has an exponential distribution with mean 4 years, and among apartment renters, it has an exponential distribution with mean 2 years. Calculate the probability that the policyholder is a home renter, given that a renter still has a policy one year after purchase. (A) 0.08 (B) 0.27 (C) 0.46 (D) 0.56 (E) 0.66