A company uses apples and pears to make a juice blend. The ratio of apples to pears (in volume) required to make the blend is 4:3. The person making the blend has 35 liters of apple concentrate and 28 liters of pear concentrate. What is the maximum amount of juice blend she can make?
A. 63 liters
B. 67.5 liters
C. 61.25 liters
D. 59.2 liters