Refer to the information provided in Figure 3.6 below to answer the question(s) that follow.


Refer to Figure 3.6. The number of DVDs Isabel rents per week increases from 4 to 7. This is caused by
◦ an increase in income if DVDs are a normal good.
◦ a decrease in the price of popcorn, which is a complement to DVDs.
◦ a decrease in the rental price of DVDs.
◦ either an increase in income if DVDs are a normal good or a decrease in the price of popcorn, which is a complement to DVDs.