Which part of the U.S. government is typically the focus of lobbyist’s efforts?

The correct answer is B. Congress.

Lobbyists typically focus their efforts on Congress because it is the legislative branch of the U.S. government that makes laws. They aim to influence lawmakers to support specific legislation or policies that align with the interests of the groups they represent. While lobbyists may also interact with the president and government agencies, Congress is generally the primary target for lobbying activities.