An element X decays first by positron em...

An element X decays first by positron emission and then two `alpha` - particles are emitted in successive radioactive decay. If the product nucleus has a mass number 229 and atomic number 89, the mass number and the atomic number of element X are

A

273, 92

B

237, 94

C

238, 93

D

273, 93

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B

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