In the Above Figure, _{-------------} Will Shift in the Demand Curve

In the above figure, _{-------------} will shift in the demand curve from D to D1.

A) an increase in income if pizza is an inferior good
B) buyers' expectation that pizza will be less expensive next week
C) a scientific article published that demonstrates eating pizza is good for one's health
D) a decrease in the price of a sub sandwich, a substitute for pizza
E) a fall in the cost of producing pizza