Final answer:
The inequality 4s ≤ 0 has a solution set of all numbers less than or equal to zero, represented as (-∞, 0], which is answer option A.
Step-by-step explanation:
The solution to the inequality 4s ≤ 0 is found by dividing both sides of the inequality by 4, which gives us s ≤ 0.
This means that 's' can be any number that is less than or equal to zero.
Therefore, the set of all numbers that are solutions to this inequality extends from negative infinity up to, and including, zero.
The correct answer is therefore option A) (-∞, 0].