Determine if 2.5/10 = 12/48 or 2.5/2 = 12/24 is a proportion

A) 2.5/10 = 12/48
B) neither is a proportion
C) 2.5/2 = 12/24
D) both are proportions

C) 2.5/2 = 12/24

This is a proportion because both sides reduce to 1.25 = 0.5.