In building a scenario analysis for a financial model O A. a single variable (or assumption) is changed to determine the how much the net present value of the project changes when that variable is changed. O B. a probability distribution is set for variables (or assumptions) and multiple sets of possible cash flows and net present values are computed using random draws from the distributions. O C. mutiple variables (or assumptions) are changed at the same time to determine the impact on the net present value of the project. O D. the expected return and standard deviation of the initial cash outlay is used to calculate the probability of a negative net present value.