can slow down the decomposition of hydrogen peroxide.

The correct option is B Urea
$H_2{O}_2$ decomposes on exposure to sunlight or on heating.
It also decomposes on standing but at a slow rate.
This reactions occurs explosively when $H_2{O}_2$ is in contact with dust.
Urea acts as a negative catalyst to this reaction and slow down the decomposition of hydrogen peroxide.