Jim is a middle school transfer student. Upon entry to his formal course, he is asked to take an assessment test, which will determine his future curriculum. His advisor suggests that on average, one needs a preparation of 50 hours to pass the test on first attempt. However, according to the data collected, only 40% of the students would prepare for more than 40 hours, 25% of the students would prepare for less than 20 hours while others’ preparation hours are in between 20 and 40. 87% of those students who spend more than 40 hours, 56% of those who spend between 20 and 40 hours, and 12% of those who spend less than 20 hours, could pass the test on first attempt. If Jim failed on the test on his first attempt, what is the probability that he had prepared for more than 40 hours?
选项：

A:12.21%
B:60.63%
C:87.79%
D:39.37%