As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom / ion :

Question

$\begin{array}{1 1} \text{its kinetic energy increases but potential energy and total energy decrease } \\\text{kinetic energy potential energy and total energy decrease } \\\text{kinetic energy decreases, potential energy and total energy decrease } \\ \text{ kinetic energy and total energy decreases but potential energy increases } \end{array}$