Suppose that gasoline prices increase dramatically this month. Jahzara commutes 100 miles to work each weekday. Over the next few months, Jahzara drives less on the weekends t o try to save money. Within the year, she sells her home and purchases one only 10 miles from her place of employment. These examples illustrate the importance of O a. the availability of close substitutes in determining the price elasticity of demand. O b. a necessity versus a luxury in determining the price elasticity of demand. O c. the definition of a market in determining the price elasticity of demand. O d. the time horizon in determining the price elasticity of demand