Which statement accurately explains whether a reflection over the Y axis and a 270° counterclockwise rotation would map figure ACB onto itself?

Answer:
Option B is the answer.
Step-by-step explanation:
Triangle ACB when reflected over the Y axis triangle will lie in 2nd quadrant and coordinates of A, C and B will become A'(-1, 1), C'(-3, 4) and B'(-5, 1) respectively.
Now this triangle is rotated by 270° counterclockwise.
After rotation triangle ACB will lie in 1st quadrant and map itself again.
Coordinates of A", B" and C" will become A"(1, 1), B"(5, 1) and C"(3, 4)
Option B. will be the answer.