I think the answer is D. Violence only when absolutely necessary he said that there is violence is never necessary.
I would say D is NOT one of the reasons why life is found only on Earth
Portugal is a country full of wonders — charming castles, pristine beaches, and a metropolitan capital spattered in remnants of the past. Its buildings are covered in thousands of intricately decorated tiles in countless colors and patterns. ... The words to describe Portugal are endless.