Which of the Following Statements Is Correct

Which of the following statements is correct?

A) The parity ratio has not exceeded 100 in the 20th or 21st century.
B) An increase in prices paid by farmers relative to prices received by farmers will increase the parity ratio.
C) The parity ratio has generally been greater than 100 in the past four decades.
D) The parity ratio has generally declined over the past five decades.