The refusal by the senate to approve the president's budget or nominations of judges is an example of what?

a federalism
b separation of powers
c checks and balances
d bicameralism

For this question, Checks and Balances  seems to be the best answer.

The Senate is making sure that the President is kept in check.

I hope this helps! :)

i would have to say i believe that it is a.

what is the question