Answer the question on the basis of the following marginal utility data for products X and Y. Assume that the prices of X and Y are $4 and $2, respectively, and that the consumer's income is $18. 
Which of the following represents the demand schedule for X?
Definitions:
Autobiographical memory
The aspect of memory that involves the recollection of personal experiences and events in one's life.
Explicit memory
A type of long-term memory that involves conscious recollection of specific facts and events that can be verbally stated.
Implicit memory
A type of long-term memory that enables us to perform tasks without conscious awareness of these previous experiences.
Procedural memory
A type of long-term memory involved in the acquisition of skills and tasks that can be performed without conscious awareness.
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