Which table shows a proportional relationship between a and b?

Table B

Step-by-step explanation:

we know that

A relationship between two variables, a, and b, represent a proportional variation if it can be expressed in the form or

In this problem the table B shows a proportional relationship because

For a=20, b=25 -----> b/a=25/20=1.25

For a=24, b=30 -----> b/a=30/24=1.25

For a=32, b=40 -----> b/a=40/32=1.25

The constant of proportionality k is 1.25