How might partisanship to diminish the exercise of congressional power over the presidency?

Partisanship represents the division between political parties. This division is caused because some disagreement between the parties and none of them wants to admit that the opinion of the other is better. This diminishes Congress' exercise of power over the presidency because parties can not come to a conclusion about approving or disapproving serious initiatives in Congress and the presidency. This is because in order for an initiative proposed by the president to be approved at the congress, the senators must conclude whether or not the initiative should be approved. But partisanship prevents them from reaching this conclusion because they only fight and each wants to defend something different.

the answer is a) to be able to obey them.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.