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Choose the correct option: A small blo...

Choose the correct option:
A small block of mass 'm' is placed on bigger block of mass `M_(1)` which is placed on a frictionless horizontal surface. The two blocks are given equal speed `u_(1)` but opposite directions, as shown in the figure. After sometime, it is observed that both blocks are moving in the direction of motion of the lower block, with a speed greater than `(u)/(2)`. It can be concluded that -

A

(a) `Mgt3m`

B

(b) `3Mltm`

C

(c) `mgt2M`

D

(d) M and m can have any value such that `Mgtm`

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