Hey!
A physical hazard is a danger (hazard) that can occur physically. Let's check the answer choices.
A: bacteria, this is not a physical, it's a biological hazard.
B: viruses, this is also a biological hazard
C: Hair, it's not likely to cause any physical hazard, we may sometimes eat hair without even knowing it.
D: pesticide, this is actually a physical hazard, because if it stays in contact with your skin for a long period of time, it can cause irritation and damage. This would be your answer.
Thanks!
-TetraFish