Which of the Following Statements Is Correct

Which of the following statements is correct?

A) If you can buy the same goods this year as you bought last year with less money there must have been inflation.
B) If purchasing the same goods today that were purchased one year ago requires more money, there must have been deflation.
C) If purchasing the same goods today as one year ago requires less money, the money supply likely decreased.
D) If purchasing the same goods today as one year ago requires less money, the money supply likely increased.