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.
At collision they push together and then subduction(one plate going to the asthenosphere and becoming magma.).
A meander is best described as a bend or curve in a stream channel.
