Answer:
c.
grouping up so that many senators can speak on the issue for the one hour maximum thus still preventing a vote from occurring
Explanation:
According to the cloture rule of United States Constitution which is also known as Rule number 22, senators group together in order to break the situation of filibuster.
Filibuster is known for the condition where people attempt to block the action of senators in the different matters. Under the rule 22 consideration for different matters can be limited to 30 hours by senators.