Sarah climbed 3,900 feet of the way up Pikes Peak and then stopped to rest. After she stops, she continues to climb at a rate of 80 feet per hour for h hours. Which expression indicates her elevation, in feet, h hours after she stops? A. 3,900 + 80 × h
B. 3,900 - 80 × h
C. (3,900 + 80) ÷ h
D. 3,900 ÷ 80 × h