One very important role that political parties serve is to a. Make sure that they have a good turnover in their candidates. b. Always provide accurate information about the issues to the public. c. Antagonize the president of the opposite party. d. Provide shortcuts in explaining public policy to the public.

d. Provide shortcuts in explaining public policy to the public.

Explanation:

Political parties do have the understanding that they are serving the public, hence need to make all dealings, business, decisions public, so the masses know what's at stake and are carried along. When these are not made known to the public there is a tendency of things going wrong, looting and public funds abused, the people not regarded, and political offices become business places.