A solid cube of the edge a is molten and...

A solid cube of the edge a is molten and moulded in eight identical small solid cubes and are placed on one other on a straight line with the edge of the bottom cube on the same horizontal plane on which big cube was placed , then the vertical shift in the centre of mass is

A

`(3a)/2`

B

`2a`

C

`(5a)/2`

D

`3a`

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A

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