Which best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs?

Question

Rare metal on earth called iridium isfound in layers where dinosaurs disappeared.
Many dinosaur skeletons are found in one particular rock layer.
Dinosaur fossil remains are found at the bottom of a body of water.
Bodies of dinosaurs are only found in craters where asteriods collided.

Answer 1

Rare metal on earth called iridium is found in layers where dinosaurs disappeared.