The correct answer is: B. Sensitivity
Sensitivity is the ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth. It is a measure of how responsive the outlet is to changes in water level. A high sensitivity indicates that the outlet will respond quickly to changes in water level, while a low
sensitivity indicates that the outlet will respond slowly to changes in water level.Efficiency is a measure of how well an outlet uses its energy to deliver water. A high efficiency indicates that the outlet is using its energy efficiently, while a low efficiency indicates that the outlet is not using its energy efficiently.
Flexibility is a measure of
how easily an outlet can be adjusted to meet changing conditions. A high flexibility indicates that the outlet can be easily adjusted, while a low flexibility indicates that the outlet cannot be easily adjusted.Modular limit is the maximum discharge that an outlet can safely handle. A high modular limit indicates that the outlet can handle a large discharge, while a low modular limit indicates that the outlet can only handle a small discharge.