Answer:
They are obedient, they know or when not to do something such as going to the bathroom, they understand common things such as fetch sit stand or stay, and they know how to walk on a leash
Explanation:
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.
We need more information! : ) I'll gladly help though!