What is a filibuster?

a. the number of members needed to be present for a vote to occur

b. an effort to talk long enough to prevent a vote on a bill

c. a rule for limiting the time for debate on a bill

d. the practice of setting aside and not considering a bill

b. an effort to talk long enough to prevent a vote on a bill.

Explanation:

A filibuster is a political process which consists of debating over a proposed piece of legislation in a way that purposely delays or prevents having to make a decision on it. This usually takes place in a Parliament or Congress, as these are generally the bodies of government that deliberate on legislation. This form of obstruction in a legislature is a powerful political device.