Mr Black Always Consumes Coffee and Cream in Fixed Proportions-8

Mr. Black always consumes coffee and cream in fixed proportions-8 ounces of coffee to 1 ounce of cream. This implies that for Mr. Black:

A) coffee and cream are perfect substitutes.
B) the indifference curves for coffee and cream are tangent.
C) 8 ounces of coffee and 2 ounces of cream yields more utility than 8 ounces of coffee and 1 ounce of cream.
D) coffee and cream are perfect complements.