How Might Rallying Events Affect Presidential Politics

How might rallying events affect presidential politics?

A) Rallying events lead to drops in presidential approval ratings,making passage of their agendas more difficult.
B) Rallying events have no effect on presidential politics.
C) Rallying events make presidents more politically cautious.
D) Rallying events tend to temporarily increase presidential approval ratings,providing windows of opportunity to press for action on their agendas.
E) Rallying events permanently increase presidential approval ratings,guaranteeing reelection.