Suppose that, as a result of an increase in the price of wheat, several large US grocery chains, such as Harris Teeter and Food Lion increase the prices of all of their bread products it follows that, Ceteris paribus, the increase in the price will increase:

A: Both the CPI and the GPD deflator

B: neither the CPI nor the GDP deflator

C: The GPD deflator but not the CPI

D: The CPI but not the GDP deflator