An element A decays into element C by a two step process

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An element A decays into element C by a two step process
A → B + ₂He⁴
B → C + 2e^-
Then

1. A and C are isotopes
2. A and C are isobars
3. A and B are isotopes
4. A and B are isobars

Correct Option: A

From eqn. (ii), B has 2 units of charge more than C.
From eqn. (i), A loses 2 units of charge by emission of alpha particle. Hence, A and C are isotopes as their charge numbers are same.