JEE Main 2020 Physics question

A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass collides with A with a velocity which is half the instantaneous velocity of A. The collision is completely inelastic. Then, the combined body-

• (A)starts moving in an elliptical orbit around the planetCorrect
• (B)continues to move in a circular orbit
• (C)falls vertically downwards towards the planet
• (D)escapes from the planet's gravitational field