1.) a filibuster to block a vote on a bill is possible
-only in the house, which is almost unrestrained
-only in the senate, which is almost unrestrained
-mostly in the house, but occasionally in the senate
-mostly in the senate, but occasionally in the house

An upper house, sometimes called a Senate, is one of two chambers of a bicameral legislature (or one of three chambers of a tricameral legislature), the other chamber being the lower house.[1] The house formally designated as the upper house is usually smaller, and

Ibelieve the answer is c