When shopping you found a pair of sneakers that costs $20 and a tee-shirt that costs $10. You calculate the price of pair of sneakers relative to tee-shirt. Which statement is true? Select one: O a. The dollar price of sneakers and the relative price of sneakers are both nominal variables. O b. The dollar price of sneakers and the relative price of sneakers are both real variables. O c. The dollar price of sneakers is a nominal variable; the relative price of sneakers is a real variable. O d. The dollar price of sneakers is a real variable; the relative price of sneakers is a nominal variable