If both the President and the Vice President can no longer serve, who becomes President?

The correct answer is the Speaker of the House because the Presidential Succession Act of 1947 establishes the order of succession to the presidency. If both the President and Vice President are unable to serve, the Speaker of the House is next in line. This is designed to ensure continuity of leadership within the federal government and provides a clear line of authority in the event of vacancies in the highest offices.

The position of Speaker is held by a member of the House of Representatives, making it a critical role in the government structure. Given the importance of the Speaker's role in legislative action and representing the interests of the public, this line of succession helps maintain a functioning government during times of crisis.

The other options present significant roles within the government but do not fall in the line of presidential succession as established by law. The Senate Majority Leader, while a powerful position in the Senate, is not next in line. Similarly, the Secretary of State serves a crucial role in diplomacy and foreign affairs but is not part of the presidential succession chain. The Governor of a state, meanwhile, oversees state matters and does not have any claim to the federal presidency if the aforementioned positions are unavailable.