Atomic mass of thorium is 232 and 1 ts a...

Atomic mass of thorium is 232 and 1 ts atomic number 90.The number of a particle and `beta` particles which will be lost so that an isotope of lead (atomic mass 208 and atomic number 82) is produced is

A

`4 a + 6 beta`

B

`6 alpha + 4 beta`

C

`8 alpha + 2 beta`

D

`10 alpha + 2 beta`

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