A quick guide to approaching questions that ask you to find an assumption required by the argument. This question asks you to identify the claim that must be true or is required in order for the argument to work. In other words, there is a silent, unspoken piece of support that the arguer is taking for granted to be true, and your job is to explicitly identify what that piece is. A good way to think of necessary assumptions is: if that statement were to be false, the argument's reasoning would be undermined.