Problem understanding the logic of this verbal sentence

Hi, here my answer logic also made sense while that didn’t turn out to be the right ans

Altho…has been more “DORMANT” than any.., it’s long dormancy before it’s recent eruption “PROVED” it’s violent nature.

This approach also makes sense, how do I think the other way? Pls suggest.

Read this thread and tell me if it answers your question: