(Table: Martinez Family Household Income and Expenditures) Use Table: Martinez Family Household Income and Expenditures. The Martinez's income elasticity of demand for falafels, computed using the midpoint method, is: Table: Martinez Family Household Income and Expenditures Quantity Purchases per Month MonthlyIncom Hamburgers Books Online Movie Falafel D Rentals $2,000 $3,000 O a. -1.4. O b. approximately 0.7. O c. approximately -0.7. O d. o