Answer: discrepancy of quantity
Explanation: A discrepancy refers to a lack of consensus or equilibrium. You can appeal to your supervisor if there were a disparity between the income you earn and the amount on your salary. There is a disparity between two items that ought to be the same.
Comparably, quantity discrepancy relates to the distinction between the number of products that a producer needs to create and the volume that end-users, as well as customers, usually need.
Thus, from the above we can conclude that the correct option is B.