What are the consequences of illegal dumping of toxic waste?

I- The illegal dumping of toxic waste is one of the most harmful forms of pollution in the oceans.
II- Toxic chemicals and heavy metals, such as lead, affect human health and can cause damage to the brain, kidneys, and reproductive system, causing birth defects, slow growth, and hearing problems.
III- The dumping of toxic substances is depleting the world's fish population.
IV- The accumulation of plastics is one of the main causes of ocean pollution.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only III and IV are correct.
d) All statements are correct.