Answer:
A shift in the demand curve occurs when a variable, other than price, affects demand.
A shift to the left means that demand is falling, while a shift to the right means that demand is rising.
In this case, positive news about the nutritional value of apples will shift the demand curve of apples to the right, because more people will want to buy apples in order to take advantage of their nutritional qualities.
For this reason, the XY demand curve will represent a shift to the right of the previous AB demand curve.