The Sun Exerts a Gravitational Force on the Earth and the Earth

Multiple Choice

The sun exerts a gravitational force on the earth and the earth exerts a gravitational force on the sun. The force the earth exerts

A) is the action force.
B) is the reaction force.
C) can be considered either as the action or as the reaction force.
D) is not part of an action-reaction pair because the earth and sun are not in contact with each other.