The answer should be A, as anorexia nervosa is when someone worries far too much about their weight and begin to eat far less, becoming severely underweight.
Participating in extreme sports can help your cardiovascular system work properly and better because extreme sports usually are very taxing in terms of being an aerobic sport which also puts a lot of burden on the aerobic system. Another benefit would be not so health-related but more personal; doing extreme sports and being close to death - which can hppen - makes one more appreciative and aware of life and death.
Since trouble communicating can lead to difficulty in creating rapport, I would say true.
