Explanation
Venus is the closest planet to Earth, therefore the correct answer is C: Venus.
Venus is the second planet from the Sun, and it is the closest planet to Earth in terms of distance. At its closest approach, Venus is about 38 million kilometers (24 million miles) away from Earth. Venus is similar in size and composition to Earth, and it is often referred to as Earth's "sister planet."
Because of its proximity to Earth, Venus is one of the brightest objects in the night sky, and it is often visible to the naked eye. It is also one of the easiest planets to observe through a telescope. Despite its proximity, Venus is a difficult planet to study because of its thick atmosphere, which makes it difficult to see its surface. However, spacecraft missions to Venus have provided valuable insights into the planet's geology, climate, and atmosphere.