Exhibit 19-5.Firms A,B,and C operate in the market for computers.Each firm's product is popular in the market and distinct from what the other firms offer.The following table shows the prices of laptops from 2005 through 2007. 
Refer to Exhibit 19-5.If 2005 is used as the base year,which of the following statements about the prices of these laptops is true?
Definitions:
DSM-5
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, a comprehensive classification of officially recognized psychiatric disorders.
ADHD
Attention Deficit Hyperactivity Disorder, a neurodevelopmental disorder characterized by patterns of inattention, hyperactivity, and impulsivity.
Comorbidity
The co-occurrence of two or more disorders or medical conditions in the same individual, often complicating diagnosis, treatment, and prognosis.
Equifinality
A basic principle of developmental psychopathology which holds that one symptom can have many causes.
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