Which of the following is not a physical change?
drying of wet laundry,
shattering of glass,
freezing of water, or
explosion of fireworks

Your answer is the last option, the explosion of fireworks. This is because all of the other options are physical changes because they don't change the substance, they only affect it in some way. However the explosion of a firework clearly changes a substance inside the initial 'rocket' into fireworks.

I hope this helps!