Each of the 45 boxes on shelf J weighs less than each of the 44 boxes on shelf K. What is the median weight of the 89 boxes on these shelves?

a) The median weight is the average of the lightest box on shelf K and the heaviest box on shelf J.

b) The median weight is the weight of the box in the middle when all boxes are arranged in ascending order.

c) The median weight is the sum of the weights of the lightest box on shelf K and the heaviest box on shelf J.

d) The median weight cannot be determined without knowing the exact weights of the boxes.