When did the Pu’u ‘O’o crater on Hawaii’s Kilauea...

Câu hỏi: When did the Pu’u ‘O’o crater on Hawaii’s Kilauea volcano collapse?

A. On April 30, 2018

B. On April 20, 2018

C. On April 30, 2017

D. On April 20, 2017