When he was in high school, Kyong was a gymnast, making him very flexible. Now he is much older and works in an office during the day. He does not have the time to exercise like he used to. Is he still likely to be very flexible?

A. Yes, muscles rarely change over time, even as people age.
B. No, he will lose flexibility as he ages if he does not actively maintain it.
C. No, what one does on the past has no impact of future muscle development.
D. Yes, he was once an athlete, so he will always have an athletic body composition.