Related to the Economics in Practice on P

Related to the Economics in Practice on p. 51: The Amazon Kindle and the electronic textbooks available for the Kindle are complementary goods. Electronic textbooks and traditional, hard-copy textbooks are substitute products. If the price of the Kindle decreases

A) demand for the Kindle increases and demand for traditional, hard-copy textbooks decreases.
B) the quantity of Kindles demanded increases and demand for electronic textbooks increases.
C) demand for the Kindle increases and the quantity of electronic textbooks demanded increases.
D) the quantity of Kindles demanded increases and the quantity of electronic textbooks demanded increases.