How Do Congressional Staffers Use Information from Constituent Contacts in a Way

How do congressional staffers use information from constituent contacts in a way that helps the member of Congress win reelection?

A) Congressional staffers use the information to tailor their communications to voters based on the issues they care about.
B) Members of Congress conduct additional research about those issues that are most pressing to their constituents.
C) Congressional candidates sell the data to marketing companies and keep the proceeds for their campaign coffers.
D) Members of Congress use this information to conduct congressional business at home, where they can attend various events that help fund their campaign.