The Franking Privilege, Which Allows Members of Congress to Send

The franking privilege, which allows members of Congress to send mailings free of charge, reinforces an incumbency advantage because:

A) members can remind constituents of their activities and service through these mailings, and make themselves more visible.
B) it prevents candidates who are unable to raise large sums of money from running against them.
C) members may more efficiently serve constituents and solve problems for them, given the importance of sending documents in such service.
D) it is a more effective means of communication in service to all constituents than electronic mail, since some segments of the population do not have Internet access.