Study the equation. Circle the variable that has a coefficient of 1
x - 4y = 12
Solve for the variable you just circled.

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

here is a big fat

i think the answer is b. i hope i !