Answer:
The correct answer would be, Ignoring and start again, reminding yourself to leave a sign or a barrier, next time you take a break.
Step-by-step explanation:
If I have been working for several hours to carefully organizing some office supplies, when I stop my work to take a break. I just leave the work and go on the break without putting any sign or tag over there. When i came back, i saw that one of my colleague has been carelessly searching through the supplies and has messed up a lot of work I did. I would probably won't say or do anything, because the mistake is mine, I didn't put any sign or barrier or tag at that place to restrict workers from coming into that area. So I would ignore my co worker's careless behavior and make myself sure about putting the sign next time I take a break.