According to the text, which of the following is true about the effects of fireworks?

I - Fireworks can cause hearing damage to dogs.
II - Fireworks can cause anxiety and fear in pets.
III - Fireworks can cause respiratory problems in people.
IV - Fireworks can cause environmental pollution.
a) Only I and II are true.
b) Only II and IV are true.
c) Only I, II, and IV are true.
d) All statements are true.