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Which of the following reactions led to ...

Which of the following reactions led to the discovery of neutron?

A

`""_(6)^(14)C+""_(1)^(1)H to ""_(7)^(14)N+""_(0)^(1)n`

B

`""_(5)^(11)B+""_(1)^(2)D to ""_(6)^(12)C+""_(0)^(1)n`

C

`""_(4)^(9)Be+""_(2)^(4)He to ""_(6)^(12)C +""_(0)^(1)n`

D

`""_(4)^(8)Be+""_(2)^(4)He to ""_(6)^(11)C+""_(0)^(1)n`

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