One Major Difference Between the Short-Run and Long-Run Macroeconomic Analysis

One major difference between the short-run and long-run macroeconomic analysis is that:

A) in the short-run prices are fully flexible while in long-run they are not.
B) in the short-run prices are sticky while in long-run they are fully flexible.
C) in the short-run stickiness of prices would guarantee the long-run price inflexibility.
D) the price stickiness in the long-run guarantees the flexibility of prices in the short-run.