Which two ratios form a proportion?

A) 1 : 4 and 5 : 20

B) 1 : 4 and 20 : 5

C) 4 : 1 and 20 : 4

D) 4 : 1 and 4 : 20

a) 1 : 4 and 5 : 20

Step-by-step explanation:

If a ratio is a proportion that means the

quantity on the left hand side is lesser than the quantity on the right hand side; it's a part of a whole, a small fraction.

Example of proportion ratios:

4 : 7

7 : 29

90 : 200

68 : 140

Example of non-prpotion ratios:

7 : 4

80 : 19

29 : 20

It's A)