1. The person's hands, after touching the raw meat and not washing their hands; The knife, when they used the same knife to cut raw meat then proceeded to cut vegetables and fruit.
2. They could have washed their hands, the knife the counter and cutting board in between uses.
3. The school should provide specific instructions to the substitute. These will show how/when to wash the materials.
4. You would have to thoroughly wash all materials to ensure no food poisoning happens.
To eat good food and not junk food
Change diet and lose weight
According to the annual Stress in America survey, most American are stressed and a significant proportion feels their coping abilities are inadequate. Further, they report feeling that the stress is affecting their health, both physically and emotionally. The survey results tend to fluctuate a little each year, but the findings generally show the same pattern: people need to find effective ways to relieve stress in their lives, and they face a variety of stressors. And these findings can very likely apply to people of all countries as we all face stress in our lives
If i’m not mistaken i think your answer is “A”.
i hope i could help! good luck :)