Finding true statement about indifference curves and movement from price changes, economics homework help

Graph with pizza on the x-axis and apples are on the y-axis. There is a straight line budget constraint sloping down and 3 upward concave indifference curves labelled U1, U2 and U3. U1 is closest to the origin (lowest utility) and intersects the budget constraint at point W. U2 is tangent to the budget constraint at pizza = 6 and apples = 30. This is point X. U2 also has a point Y labelled which lies beyond the budget constraint. U3 is the indifference curve furthest from the origin. It does not touch the budget constraint. It has a point Z labelled at pizza = 6 and apples = 50.

FYI – All the point are supposed to lie on the indifference curves for these questions even if they appear a touch off.

Based on the budget constraint and 3 indifference curves shown here we know that:

A. If the price of pizzas were to fall while the price of apples remained constant then the budget constraint would flatten out (rotate out along the pizza axis)
B. If the price of pizzas were to fall while the price of apples remained constant then the budget constraint would flatten out (rotate in along the apple axis)
C. If the price of pizzas were to fall while the price of apples remained constant then the budget constraint would shift out in a parallel fashion
D. If the price of pizzas were to fall while the price of apples remained constant then the budget constraint would get steeper (rotate in along the pizza axis)

Please explain!

Thanks!

 
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