The Answers C
Probably not D, because its probably not that urgent as this machine can cause severe unconsciousness, or even death.
Maybe not A because it may not be there for the person for its too big, and it usually used in hospitals. Basically, its not portable.
Not B Either.
A will be the answer because usually marking your exercise days will become a habit because lets say you would do a running exercise but you want to do it in a certain day well if you mark it on the calendar, it'll become a habit.
B
If a family member has a mental illness, a person is more susceptible To having a mental illness
I’m pretty sure that your answer would be A