The correct answer is: C. Change in output due to change in input
Sensitivity analysis is a study of how much the output of a model changes in response to a change in one or more of its inputs. It is a way of understanding how sensitive the model is to changes in its inputs.
Option A is incorrect because it is a study of profit and loss, not of the change in output due to a change in input.
Option B is incorrect because it is a study of assets and liabilities, not of the change in output due to a change in input.
Option D is incorrect because it is a study of the economics of cost and benefits of a project, not of the change in output due to a change in input.