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

in (b),(c)

B

in (a),(c)

C

in (a),(b) and (c)

D

only in (a).

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