The correct answer is B. The two legislative bodies form a conference committee.
The goal of this conference committee is to find common ground in order to develop a bill that both the members of the House of Representatives and Senate can agree on. In order for a bill to be reviewed by the President, both parts of the legislative branch must agree on the same bill. These conference committees usually involve the most experienced members of Congreess who work together to make changes that will result in the bill passing both the Senate and House of Representatives.