Final answer:
Option 4: Paper towel. Paper towel cannot be immersed in liquid disinfectant because it is porous and absorbent, losing its effectiveness and potentially breaking down when exposed to certain chemicals.
Step-by-step explanation:
In this case, the answer is option 4: Paper towel cannot be immersed in liquid disinfectant. Liquid disinfectants are typically used to kill or remove microorganisms on surfaces, and paper towels are porous and absorbent, which means they would quickly become saturated with the disinfectant and lose their effectiveness. Additionally, paper towels are not resistant to the corrosive nature of some disinfectants, so they may break down or dissolve when exposed to certain chemicals.