Select the correct answer.
What is the perihelion?
A.
It is the point of a planet's orbit that is furthest away from the star it orbits.
B.
It is the distance between the closest natural satellite and the planet it orbits.
C.
It is the distance between an asteroid and the star it orbits.
D.
It is the point of an orbit at which a planet is closest to the star it orbits.