Is there a picture to look at?
I’d imagine the answer is B. Teaching I could be wrong, the reason I say it is, is because teaching is a social thing to do, providing something is more of an action if that makes any sense.
220 minus your age is your max heart rate. Then you can calculate percentages of your heart rate max based on what intensity or heart rate zone you would like to train in.
The answer in the blank would be a harmful dysfunction for it points out the social behavior of a person where it could be harmful to him or her. They are judged to be a harmful dysfunction for they are unhealthy to an individual that could be considered as harmful to the individual who is experiencing these symptoms.