PLEASE HELP M! NOT FOR BEGINNER! 1. Mountains on the bottom of the Atlantic Ocean were made from?

2. The average elevation of the Grand Canyon is 2,200 feet above sea level. Which of the following could be an explanation of why there are fossils at the top of the canyon?
A. All of the fossils came from things that lived in the Colorado River.
B. The canyon was covered by the ocean and the water receded (went down).
C. The canyon was once covered by the ocean but the land receded (went down).
D. It is still part of the ocean, that’s why there are marine animals there.