【单选题】Read the section "Stopping Plastic Trash Before It Reaches The Seas." Which sentence from the section shows why Slat's work has been attacked before?
A.
On October 26, Slat revealed the next step in his fight at an in Rotterdam, Netherlands, which is in Europe.
B.
Slat called rivers "the arteries that carry the trash from land to sea."
C.
We need to stop the trash where it begins, so it does not reach the oceans, he said.
D.
Some people have said he focused only on the plastic trash already floating in the world's oceans.