Else.
But probably because of the wording of the first option:
I 'm sure that Evolution is a fact.
"fact" is a such a definite, 100% word.
And "sure". That sounds an awful like a commitment.
Then op 3 said "believe". Not 'think', but *believe* - so that brings us back to faith, rather than reason. So....
Not sure there's anything I take as fact.
In this, I was influenced years ago by my Geography prof. He was, at that time, the President of the North American branch of the International Flat Earth Society, a group he had joined, he said, because it fostered skepticism.
So sure, sort of. 99%. Based on my limited understanding of things.... or whatever.
c.
