Since members of the presidents cabinet are usually individuals of great ability but little to no political power their primary functions are to effectively run a department and advise the president so i would say B helping raise money for the presidential election campaign, thats my best guess as their three main functions are
• directing government policy and making decisions about national issues.
• spending a lot of time discussing current national problems and how these can be solved.
• presenting bills – proposed laws – from their government departments.