The given inequality is 4x ≤ 28.
To find the solution that makes the inequality true, we need to solve for x:
Divide both sides of the inequality by 4:
x ≤ 28 / 4
x ≤ 7
So, any value of x that is less than or equal to 7 would be a solution that makes the inequality true.
The correct answer is S:{7}.