Why Does the Perception of a Mandate Matter in Presidential

Why does the perception of a mandate matter in presidential politics?

A) Since public approval has become much more important to modern presidents,most presidents rely on the mandate and the polls to measure their popularity and increase their approval ratings.
B) The presidential mandate claimed by modern presidents makes it easier for them to get their choices of Supreme Court justices approved than in the past.
C) Because Congress sees the president as holding a mandate of the people,the legislators do not block the president's agenda as vehemently as legislators in the past did.
D) Because modern presidents are more dependent on the people for election and more involved in policy making than early presidents,they are prone to claim the mandate of the people when governing.