\textbf{The distribution of the number of hours worked by volunteers last year at a large hospital is approximately normal with mean 80 and standard deviation 7. Volunteers in the top 20 percent of hours worked will receive a certificate of merit. If a volunteer from last year is selected at random, which of the following is closest to the probability that the volunteer selected will receive a certificate of merit given that the number of hours the volunteer worked is less than 90?} 
选项为:A:$$0.077$$  B:$$0.123$$  C:$$0.134$$  D:$$0.618$$  E:$$0.923$$  请回答其中一个选项.