Answer:
Scale factor: 1/2
Step-by-step explanation:
Think of it as division.
From side B to C it is 3 units.
From side B' to C' it is 1.5 units.
I always start with 1/2 (if reduction) because it is most common.
3 divided by 2 = 1.5
/0.5 as a fraction is 1/2
