Answer:
The force is B. gravitational force.
Step-by-step explanation:
A force from a fixed center point which directs the moving body towards it is called centripetal force. This force makes the body to follow a curved path.
In the case of sun and earth, the force which makes the earth follow a particular orbit and hold it in the same orbit is the gravitational force exhibited by the sun.
Gravitational force is a pulling force that attracts objects with mass. Every object in the universe is pulling on another object even when they are very far from each other.