Answer:
c. nominal variable
Explanation:
Nominal variable is a variable that hasn't been adjusted for inflation. E.g. price level
Nominal variable = real variable + inflation rate
Real variable are variables that have been adjusted for inflation rate. E.g. real GDP
Real variable = nominal variable - inflation rate
Relative variable is the value of a variable in terms of another variable. E.g. comparative advantage
Dichotomous variable are variables that can take on either two values when measured e.g. gender
I hope my answer helps you.