Which of the following was the first man made object to leave the solar system?

Pioneer 10, launched in 1972, was the first spacecraft to achieve solar escape velocity and travel beyond all the major planets. While Voyager 1 later overtook it and became the first to enter interstellar space, Pioneer 10 holds the distinction of being the first human-made object on a trajectory to leave the solar system. The correct answer is C, not the Voyager probes which came later.