Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Following a sharp increase in the price of energy, the overall price level is most likely to rise in the short run:
Option A:and remain elevated indefinitely unless the central bank tightens.
Option B:but be unchanged in the long run unless the money supply is increased.
Option C:and continue to rise until all prices have increased by the same proportion.

Answer: B