Answer: I would contend that the right answer is the B) Players often return to a game after a head injury—they.
Explanation: By using a dash or specifically an "em-dash" ( — ) at the end of the sentence, the writer is clarifying or amplifying the information that he or she has already provided (that players often return to a game after a head injury). Options C and D are grammatically incorrect, so they should be discarded. Furthermore, since the two sentences ("players..." and "they do not want...") are not independent, the use of a semicolon (option A) should also be discarded.
<span>At the beginning of the paragraph, the topic is about how volunteering is beneficial for one's general health as it may include minor-to-moderate physical activity and reduces chronic pain and heart disease symptoms. Then, it explains that not all voluntary work may fulfill this need due to their sedentary nature, and how such should be combined with actual physical activity. From there, the paragraph goes on to say which are examples of everyday activities that can be turned into exercise, which completely diverts from the original idea.
</span>Therefore, your best answer is <span><u>The paragraph contains sentences that wander from the main topic.</u></span>
Present=existing or occurring now
past=occured previously
