The correct answer is B) standing committee.
Congressional leaders usually refer to a proposed bill after its introduction to a standing committee.
The House of Representatives in Congress is the one that has the function to create laws that benefited the citizens of the United States. The Passing of a Bill is a complex passing that starts with one Congressman has an idea and proposes the bill. If the bill has support from other members of Congress, the bill is introduced. From here, the bill has to go to a committee to be revied by the experts. Then, the bill is reported to the House floor to be debated by the members of the House of Representatives who can recommend changes. Once that happens, the bill is voted and referred to the Senate for further discussions. If it's passed, then it is sent to the executive to be signed or vetoed. If the President signs the bill, it became law.
The other options of this question were A) a conference committee. C) an ad hoc committee. D) the floor.