Which sentence doesn't contain any errors in punctuation or capitalization?

What is one way to appeal to ethos?

Which statement contains an opinion? the ants serve to protect the acacia from other plants and herbivores. the acacia depends on pollinators for the exchange of genetic material. the acacia has no chemical defenses to discourage herbivores. the ants provide the acacia with the best protection from other plants and herbivores.

What does wiesel use here to develop his claims?