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.
If you're referring to streams/rivers of water that run independently of another source in the ocean these are referred to as "currents" and can be very powerful depending on their location.
It is because <span><span>The islands do not have any natural resources and t</span><span>he islands are too small to provide sufficient natural resources.
Hope this helps!</span></span>