Which of the following was a map that was in Team Fortress 2 at launch?

The correct answer is Gravel Pit. Gravel Pit was one of the original maps that was available when Team Fortress 2 was launched. It is a three-stage Attack/Defend map where one team tries to capture the control points while the other team defends them. Gravel Pit features multiple routes and strategic opportunities, making it a popular and iconic map in the game.