Which of the following powers is held by the House of Representatives?

The House of Representatives has the unique power to initiate impeachment proceedings. This authority is outlined in the U.S. Constitution, which designates the House as the body responsible for bringing charges against federal officials, including the President, for misconduct. While the Senate has the sole power to conduct the impeachment trial and vote on whether to convict or acquit, the initiation of the process starts in the House, making this a critical function of their legislative responsibilities.

The other options represent powers designated to other parts of the government. For instance, ratifying treaties is a power reserved for the Senate, requiring a two-thirds majority to pass. Confirming Supreme Court justices is also a function of the Senate, which holds confirmation hearings for nominees. Conducting foreign affairs is primarily the responsibility of the executive branch, led by the President, although Congress plays a significant role in related matters such as approving budgets and regulations. Thus, the correct answer accurately reflects the House's specific role in the impeachment process.