identify the type of hazard being described in the situation

Choices:
A. Chemical Hazard
B. Electrical Hazard
C. Ergonomic Hazard
D. Biological Hazard

Questions:
1. body pain
2. nail care implements/tools are not sterilized
3. plugging electrical device with wet hands
4. cleaning the socket with wet clothes
5. open bottles of nail polish remover
6. incorrect position of hand while giving a pedicure
7. touching the blood from the client nail of the client
8. colds, cough, headache
9. switching of an equipment by pulling the wire
10. working in a dark environment

Please answer this, i really need answer:(​