The correct options are
A Molding clay to form a toy
B Making a light mark on a paper with a pencil
- Molding clay to form a toy is a reversible change as the toy can be broken down, mixed with water to get clay again.
- Making a light mark on a piece of paper with a pencil is a reversible change as it can be erased.
- Cutting a piece of paper is an irreversible change because we cannot get the original paper after it is cut.
- Ripening of fruits is an irreversible change as once a fruit has ripened, it cannot go back to its unripe form.