I think the answer is C. emulsification.
Answer:
Physical, biological, and chemical
Explanation:
Metal shavings from food cans, fingernail, jewelries,Can openers can contaminate food items with biological , physical and chemical contaminants .
They mixed up with food during preparation or opening of the food containers .
Therefore thorough cleaning and proper storage of the food containers and can openers should be well done before opening to avoid contamination
