In the Above Figure,________ Will Shift in the Demand Curve

In the above figure,________ will shift in the demand curve from D to D?.

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