Consider three imaginary countries. In Aziria, saving amounts to $3,000 and consumption amounts to $7,000; in Graniva, saving amounts to $2,000 and consumption amounts to $8,000; and in Tanistan, saving amounts to $4,500 and consumption amounts to $10,500 . The saving rate is

a. higher in Aziria than in Tanistan, and it is higher in Tanistan than in Graniva.
b. higher in Graniva than in Tanistan, and it is higher in Tanistan than in Aziria.
c. higher in Tanistan than in Graniva, and it is the same in Graniva and Aziria.
d. higher in Aziria than in Graniva, and it is the same in Aziria and Tanistan.

d