It's being estimated that dinosaurs lived on Earth from about 237 million years ago to about 66 million years ago. So answers B and D are definately too "old", while answer A is too "young". I'd pick answer C as it's most probable.
I’m confused, 3 observations on what?
Wind, it takes nothing to use wind, which means it doesn't put harmful emissions into the atmosphere.
The answer is E.
A, B, C, and D are either irrelevant or already included.
