From what I remember, c is the correct answer.
It would most likely be the last one. Erosion is effectively the process of natural forces breaking down rock or soil, which allows it to move from place to place with the aid of forces like wind or water. I would say the answer would be the first one, but it only says rock, while erosion can affect more than just rocks. Hope this helps.
Answer:
HIIIIIII
Explanation: THE ZOOM ZOOMS IS NOT REALLY REALLY REALLY SURE HOW THE GAME WORKS AND IT DOESN'T SOUND GOOD BUT IT WONT LET ME TELL ME HOW MUCH I CANT FIND THE APP AND IT DOESN'T WORK FOR THE IPAD AND IT DOESN'T LOAD ANYMORE I WONT LET IT LOG ON MY IPAD OR IPHONE TO PLAY THE IPAD OR THE SCREEN IT IS NOT REALLY LIKE IPAD IPAD OR IPHONE OR IPOD OR IPHONE I HAVE NO NO PROBLEM WITH IT OR NOT THE APP IS REALLY REALLY COOL I LOVE THE IPAD AND IT DOESN'T LOOK LIKE AND I CANT