The central idea of this passage would be C. This is because thee passage states, "So, living in a landlocked city doesn't have to keep people from enjoying the water." Hope this helped! BTW it would help be a lot it if you gave the the most "brainliest" answer award.
I need the sentence to answer this
The correct version is there are many threats to dolphins' continued existence, and humans are just one.
3rd person because it’s told from a narrators point of view