Question

Help please!
Angle ABC is formed by segments AB and BC on the coordinate grid:
Angle ABC is rotated 90 degrees counterclockwise about the origin to form angle A’B’C’. Which statement shows the measure of angle A’B’C’?

m∠A’B’C’ = 90 degrees
m∠A’B’C’ = 180 degrees
m∠A’B’C’ = m∠ABC m
∠A’B’C’ = 2 × m∠ABC