Final answer:
Venus has the closest orbit to Earth's, with an average distance of 0.72 AU from the Sun and it approaches Earth more closely than any other planet.
Step-by-step explanation:
The orbit closest to Earth belongs to Venus. While Mercury is the nearest planet to the Sun and has a highly eccentric orbit, and Mars has a significant distance of 1.52 Astronomical Units (AU) from the Sun, it is Venus that has an orbit very nearly circular at a distance of 0.72 AU from the Sun. Moreover, Venus approaches Earth more closely than any other planet, coming within about 40 million kilometers at its nearest point. This is closer than Mars, which approaches Earth at a minimum distance of approximately 56 million kilometers.