Linesha, a College Student Working Part-Time, Receives a Wage Increase

Multiple Choice

Linesha, a college student working part-time, receives a wage increase. An avid movie buff, she increased her purchases of Blu-ray discs and reduced her purchases of DVDs. Based on this information,

A) DVDs and Blu-ray discs are substitutes.
B) Blu-ray discs are normal goods and DVDs are inferior goods.
C) DVDs and Blu-ray discs are normal goods.
D) the cross-price elasticity between DVDs and Blu-ray discs is negative.