When Making Forecasts,increasing One Variable Usually Means Decreasing Another

Multiple Choice

When making forecasts,increasing one variable usually means decreasing another.Which of the following are possible common trade-offs that should be considered in making such forecasts?
I.Product volume and prices.
II.Lower inventory and higher sales.
III.Higher growth and lower margin.

A) I and II.
B) I and III.
C) II and III.
D) All of the above.