A planet is moving round the sun in an elliptical orbit as shown, As the planet moves from A to B, which of the following is NOT true ?

1. its kinetic energy will decrease 
2. its potential energy will remain unchanged 
3. its angular momentum about centre of sun will remain unchanged
4. its speed is minimum at A

(1) and (2)

While going from A to B, K.E. increases and value of PE decreases, where speed is minimum at A. Angular momentum remains unchanged.