On a Given Morning, Franco Sold 40 Pairs of Shoes

On a given morning, Franco sold 40 pairs of shoes for a total of $800 at his shoe store.

A) The $800 is a real variable.The quantity of shoes is a nominal variable.
B) The $800 is a nominal variable.The quantity of shoes is a real variable.
C) Both the $800 and the quantity of shoes are nominal variables.
D) Both the $800 and the quantity of shoes are real variables.