This is false!
For example, let's take the situation in which you are stressed when you are not prepared for an exam and you have to take the exam. You can plan better your time and start preparing earlier or try to "stage" practice exams for yourself and the result will be less stress!
No list to choose from but there are a lot of sports to help improve coordination such as
Football
Soccer
Tennis
Gymnastics
Ballet
Archery
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My answer would be C.) Slowly increasing the amount of time spent stretching.
Because if you do a good amount of stretching per day, while gradually increasing the time spent stretching, then you are bound to become more flexible around the hips :)
A or B are both the best options in this case, but B is the best option overall because if he is interested in an activity, then he will have more motivation.