If the Prices Would Have Been Much Higher Ten Years

If the prices would have been much higher ten years ago for the items the average consumer purchased last month,then one can likely conclude that

A) the aggregate price level has declined during this ten-year period.
B) the average inflation rate for this ten-year period has been positive.
C) the average rate of money growth for this ten-year period has been positive.
D) the aggregate price level has risen during this ten-year period.