Answer:
a. Janice must adjust the total value 2018 GDP for inflation.
Step-by-step explanation:
Gross domestic product is defined as the amount of goods and services produced by a country in a particular period. It is a measure of economic growth of the country.
Real GDP is calculated from GDP by adjusting for inflation of deflation. Real GDP gives a more clear picture of the economy since it considers the reality of inflationary effect on prices.
For example when prices go up and GDP is used, it will seem the country is producing more. Which is a wrong assumption.
Real GDP give a more accurate insight into a countrie's productivity.