Which of the following is not a disadvantage of a within subjects design?

__________ is a good example of constituent casework

a. Analysis of an incumbent's policy positions prior to a debate b. Analysis of water quality within a district c. Helping a constituent navigate red tape d. Assisting a federal agency operating within a member's district

Whites are overrepresented and most minority groups are ______________________in Congress

Fill in the blank(s) with correct word