Chocolate was learned about when Europeans explored Africa. I do not know how did found out. I hope this answers the "when" part of the question
The answer is A. Clapping his hands, Mitch exclaimed, "That's exciting news!"
The internet, is the modern medium easily allowing false information and hoaxes to be spread.
Boiling point. Distillation is the process of removing one substance from another by boiling it away. This is possible because of differences in boiling points of two substances.