It depends on what the purpose of the paragraph, is my opinion. However, I recommend chronological order.
Answer:
An adult is a mature, fully developed person. An adult has reached the age when they are legally responsible for their actions.
Pretty sure the answer is C, since the others don’t really make sense. B may make a little sense, but if you think about it, highlighting MOST sentences would make things worse as critical responses focus more on the flaws on the article or matter you are talking about, and simply not the whole thing. My apologies if I am incorrect, and I hope this helped! :)
A) Add a comma after game