Answer: a. consumer price index rises much more than does the GDP deflator.
Step-by-step explanation:
The Consumer Price Index is a measure of inflation. It shows the change in the prices of a basket of goods over a period of time. If the prices of gasoline and heating oil rise, this basket will be affected and so Consumer Price Index (CPI) will increase.
GDP deflator on the other hand, adjusts the nominal GDP to a Real GDP measure. Not everything will increase in price in the country as a result of oil going up so GDP will not change by much which would limit the increase in the GDP deflator.
The CPI will therefore rise more than the GDP deflator.