Is a case of beer and money real variable

Thelma pays $60 for a case of beer, Which statement accurately identifies the types of variables involved? Select one: O a. the $60 is a nominal variable, the case of been is a real variable O b. both the $60 and the case of beeralienical ariables O c. both the $60 and the beer are nominal variables O d. the $60 is direal variable nominal variable