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Mass numbers of the elements A , B , C a...

Mass numbers of the elements A , B , C and D are 30 , 60 , 90 and 120 respectively . The specific binding energy of them are 5 Me V , 8.5 MeV , 8 Me V and 7 Me V respectively . Then , in which of the following reaction/s energy is released ?
(1) `D to 2 B ` (2) `C to B + A`
(3) `B to 2 A`

A

only in (1)

B

in (2) , (3)

C

in (1) , (3)

D

in (1) , (2) and (3)

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The correct Answer is:
A
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