Most presidents are in favor of the line-item veto because it gives them more power over
a. foreign affairs
b. political partisanship
c. presidential appointments
d. federal spending

The correct answer is D.

A line item veto is a way in which the president can veto a specific part of a bill passed by Congress. This is especially used when Congress proposes a federal spending bill to the president. This ability to manipulate the bill in order to get rid of one specific provision gives the president the control to get rid of items he/she thinks are ineffective while keeping the provisions that they think are beneficial.