A because external means what is happening outside of you while all the others are internal which is what happens inside us emotionally.
"Ever since my sister hacked my Facebook account" is incomplete because it does not finish what "ever since" started.
Answer: Endotherms
Explanation: Horse and warm-blooded
The correct answer is A) concoct, because that means "to create".
The other examples cannot be used here, because they do not have the same meaning that is needed here, they mean something else.
