What landforms are found in the western United States? A. low, rounded mountains and coastal plains

B. sharp mountain peaks and deep canyons

C. river plains and low, rounded mountains

D. plateaus and low, rounded mountains

Will give brainliest asaapppppppppppp plz im in a major hurry to finish which of these pairs of objects exerts the greatest gravitational force on each other? object 1 and object 3 object 4 and object 3 object 1 and object 4 object 4 and object 2