a
The volume of the gas present inside the typre is constant. As per Gay-Lussac's law, pressure of a given mass of gas varies' directly with the absolule temperature of the gas, when the volume is kept constant.
So, when kept in sunlight, the temperatuve rises and the pressure also rises. This increased pressure increases the momenturt of the gas molecules which exerts pressure on the walls of the typre and it bursts.
correct choice - option - $A$