Casework Is Critical to Members of Congress Providing Good Constituent

Casework is critical to members of Congress providing good constituent service. Which of the following is an example of casework?

A) Contacting the Veterans Administration agency in search of a missing benefits check for a constituent
B) Attending a town hall and answering constituent questions
C) Writing a bill to name a local post office in the member's district
D) Researching policies related to a topic that is coming up in the member's committee