Read the following examples from daily life and select the appropriate option"
A. When food gets spoiled, it produces a foul smell.
B. A slice of apple acquires brown colour when kept out for some time.
C. When an ant bites, calamine is used to ease the irritation on the skin.
1. All are chemical changes
2. A and B represent chemical changes
3. B is a physical change
4. A and B are physical changes