Which ratios have a unit rate of 3?
a) 15/2 cups:2 1/2 cups )
b) 1 cup: 1/4 cup )
c) 3 3/4 cups:2 cups
d) 2/3 cup:1 cup
e) 2 cups: 2/3 cup
f) 2 1/2 cups : 5/6 cup