A skeptical scientist is one who questions the reliability of certain kinds of claims by systematically investigating them. it is an important quality in a Scientist because it helps them remain objective when performing scientific injury and research, it also forces them to examine claims to be certain that there is sufficient evidence to back them up
Fusion is the process which sun use to produce energy
I think it would be the third one
Because science is always changing and every time you cam come up with a new outcome.