Why Would Opponents of a Bill Prefer an Open Rule

Why would opponents of a bill prefer an open rule to a closed rule?

A) Members of the House can exercise their filibuster power and block the legislation.
B) The open rule allows the other chamber to make a decision on the bill first.
C) The open rule prevents a bill's supporter from making further demands on minority party legislators.
D) The open rule makes it easier to add amendments that may weaken the bill's chances of passing.
E) An open rule means that a bill can be recalled even after it is passed.