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Consider the following nuclear reactions...

Consider the following nuclear reactions :
`""_(92)^(238)M to ""_(X)^(Y)N + 2 alpha , ""_(X)^(Y)N to ""_(B)^(A)L + 2beta^(+),`
The number of neutrons in the element L is :

A

142

B

144

C

140

D

146

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