Ocean dumping of garbage is still a common practice in the world today. which is a disadvantage to ocean dumping?

Garbage dumped into the ocean affects the ocean's ecosystem and may drift back to shore, where it can become a health risk to humans.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.