Why Were Disappearing Quorums Effective Before the Reed Rules

Why were disappearing quorums effective before the Reed Rules?

A) Representatives could be counted as not present and stop consideration of bills.
B) Representatives could speak at length against bills and could not be stopped.
C) Representatives could not be forced to vote on measures and often did not.
D) Senators could be counted as not present and stop consideration of bills.
E) Senators could speak at length against bills and could not be stopped.