Answer:
Point B: (-8,2)  Point C: (-8,9)  Point D: (-5,4)
Step-by-step explanation:
Since you are reflecting over the y-axis, the numbers in the coordinates will be the same but they will all have a negative "x" value instead of both numbers in the coordinate being positive.
Point B: (8,2) -->  (-8,2)
Point C: (8,9) -->  (-8,9)
Point D: (5,4) -->  (-5,4)