The argument is that congressional representatives make too much money to be able to understand the needs of working people. So we must find the answer that makes this statement the most false. In other words, we need to look for a statement that shows that it doesn't matter how much money congressional representatives make, they can still claim to understand the needs of the working people.
I think the answer is E.
A) The salary of a member of Congress is usually supplemented by fees for outside speaking and consulting.
This may explain why members of Congress can make a lot of money, but not why they can understand the needs of the working people.
B) Members of Congress need large salaries because of the cost of maintaining a second family home in Washington, D.C.
This may explain why members of Congress can make a lot of money, but not why they can understand the needs of the working people. Most working people will not need to maintain a second family home in DC.
C) Most members of Congress spend considerable time meeting with their constituents in an effort to learn about their concerns.
If this is true, then it will explain that members of Congress can understand the needs of the working class, even with their high pay, because members of Congress spend time with the working class. This is a good possible answer. The only issue is with the "most members" segment, which suggest that some members of Congress do not do this.
D) It is important to pay a high salary to members of Congress in order to attract the best people for the job.
This may explain why members of Congress can make a lot of money, but not why they can understand the needs of the working people. There are many aspects of working in Congress, and understanding the needs of working people is only one of them.
E) One need not personally experience a problem in order to understand it.If this is true, then members of Congress can understand the needs and concerns of the working people, regardless of pay and status. This is a better answer than C.