Suppose Two Goods Coffee and Creamer Provide the Consumer with Utility

Suppose two goods coffee and creamer provide the consumer with utility but only if they are consumed in fixed proportions.An increase in the price of coffee will yield

A) a substitution effect and an income effect in opposite directions.
B) a substitution effect and an income effect in the same direction.
C) a substitution effect but no income effect.
D) an income effect but no substitution effect.