Sum of Mass Numbers must be constant
Sum of Atomic Numbers must be constant

Atomic Number should be on the left side but that are formatting problems.

Alpha Decay           Reactant --->  Product  +  ⁴He₂  +  energy   

Positron Decay       Reactant --->  Product  +  ⁰e₊₁  +  energy   

Beta Decay             Reactant --->  Product  +  ⁰e_-1  +  energy   

Electron Capture     Reactant +  ⁰e_-1  --->  Product  +  energy   

The Correct Answer is D.