Which passage from the Article best supports the idea that Etsy keeps close watch on the products sold on its site?

Sullivan also said the Alaska Native artists were following U.S. law. Under U.S. law, Alaska Natives can use some animal parts.
There are earrings made from feathers. Etsy's products are often one of a kind.
In February 2018, Etsy stopped selling some artwork. It was made by U.S. Alaska Native artists. Some of these artists used ivory from walruses.
Etsy is an online store. It's based in the U.S. Artists from around the world use Etsy.

In February 2018, Etsy stopped selling some artwork. It was made by U.S. Alaska Native artists. Some of these artists used ivory from walruses.