A bob of mas `M` is suspended by a massless string of length `L`. The horizontal velocity `v` at position `A` is just sufficient to make it reach the point `B`. The angle `theta` at which the speed of the bob is half of that at `A`, satisfies.
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/16117894291152387561611789429.png)
.
A. `theta =(pi)/(4)`
B. `(pi)/(4) lt theta lt (pi)/(2)`
C. `(pi)/(2) lt theta lt (3pi)/(4)`
D. `(3pi)/(4) lt theta lt pi`