The most powerful leader in the House of Representatives is the Speaker of the House. To confirm this, you can look up the order of succession in the House leadership, which is typically determined by their roles and responsibilities. The Speaker of the House is elected by the members of the House and is tasked with presiding over the House, setting the legislative agenda, and deciding which bills are brought up for a vote. They hold significant influence over the legislative process and play a crucial role in shaping the direction of the House's work. Therefore, the correct answer is option a. Speaker of the House.
