John had little to do on the weekends after the divorce and started reading about divorce statistics. He found that the average marriage lasts for 120 months with a standard deviation of 40 months. Johns marriage had lasted for 54 months. If the length of a marriage follows a normal distribution, how long does a large part of a marriage last longer than Johns marriage?

a)95.05%

b)49.5%

c)9.5%

d)4.95%