LOL. "brave new world" was written in 1931. In 2018 there is no evidence that you can retain knowledge when you're sleeping if someone whispers in your ears", its a myth !
Longitudinal thats what i heard my teacher say oncr
B) American colonists like Samuel Adams and George Washington who fought for independence from Britain.
I'd say that the answer is observational study because they're just analyzing the data and if it were an experiment they'd be taking data and comparing it.