Let's consider the printer and the cartridges as two complementary goods. Following an event, the price of the cartridges drops. This would generate:

a)A decrease in the demand for cartridges and printers

b) An increase in the demand for cartridges and an increase in the demand for printers

c) A decrease in the demand for cartridges and printers

d) An increase in the quantity of cartridges demanded and an increase in the demand for printers