f) In January, 2,500 quarts of ice cream are sold in Boston at $2 a quart. In February, 3,000 quarts are sold at $2.50 a quart. Which of the following could have caused the change in quantity sold and price? (Don't forget to draw a Demand-Supply graph here as well!) ~ u iv. Reduction in wages in the Boston area Introduction of labor-saving automated ice cream-packing machinery Release of a medical study showing that ice cream consumption improves mental health Decision by Boston ice cream sellers to eliminate discount coupons