The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true.

Its kinetic energy increases and its potential and total energies decrease

For hydrogen and hydrogen like atoms $E_n=-13.6 \frac{z^2}{n^2} ~eV$

$U_n=2 E_n=-27.2 \frac{z^2}{n^2} ~eV$ and $K_n=\left|E_n\right|=13.6 \frac{z^2}{n^2} ~eV$

From these three relations we can see that as n decreases, $K_n$ will increase but $E_n$ and $U_n$ will decreases.