As of 2021, research is being conducted to study the effects of space travel on the human body. For example, astronauts stay on the International Space Station (ISS) on missions, and the amount of radiation they are exposed to is measured. Suppose the radiation they are exposed to on a regular six-month mission follows a normal distribution with a mean of 75 millisieverts (mSv) and a standard deviation of 20 mSv. If the risk of cancer increases when the astronauts are exposed to more than 100 mSv, what is the probability that an astronaut's cancer risk will increase during a regular mission?
A. 0.394
B. 0.606
C. 0.894
D. 0.106