A bean plant grows at a constant rate for a month. After 10 days, the plant is 30 centimeters tall. After 20 days, the plant is 50 centimeters tall Which equation models the height of the plant, y, after x days? OA y-30-(x-10) B. y-30-2(x-10) O C. y + 30 = (x+10) OD. y-10=2(x-30). The answer is B.​