In the arrangements shown in the figure masses of each ball is `1 kg` and mass of trolley is `4 kg`. In the figure, shell of mass `1 kg` moving horizontally with velocity `v = 6 ms^(-1)` collides with the ball and get stuck to it then its maximum deflection of the thread (length `1.5 m`) with vertical
A. `53^(@)`
B. `37^(@)`
C. `30^(@)`
D. `60^(@)`
