Match the Clumn I of the nuclear processes with Column II containing parent nucleus and one of the end products of each process.

Answer

`(Atoq; Bto p; Cto s; Dto r)`

Explanation

In `alpha` decay mass number decrease by 4 and atomic number decrease by 2.
in `beta^(+)` decay mass number remains unchanged while atomic number decrease by 1.
in fission parent nucleus break into almost two equal fragments in proton emission both mass number and atomic number decrease by 1.