Hi
First, let's find the equation, by solving each equation.
A) 48x = 12
12/48 = 0.25
Check if that fits in with the problem.
12 x 0.25 = 48?
Nope,
12 x 0.25 = 3
B) 12x = 48
48/12 = 4
Check if that fits in with the problem.
12 x 4 = 48?
Yes!
12 x 4 = 48
The answer is B.
Hope this helps! :)