Answer:
3. dispose into the trash of biological wastes.
Explanation:
Since blood is a biological waste, first, you need to wear gloves to manipulate it. Then if we are talking about a hospital, there are going to take it into the trash and use a new one. But in a school, probably you are going to reuse it. If it is the case, you need to clean it with sodium hydroxide at 10 %, leave it there for some minutes and then wash it with some degreaser.
