Answer: Option (a) is the correct answer.
Explanation:
A change which brings no chemical change in composition of the substance is known as a physical change.
For example, bending of metal strip is a physical change as it does not change the chemical composition of substance.
Whereas metal changes color, metal gives off light, and metal gives off heat are all chemical changes.
Thus, we can conclude that out of the given options, the metal bends more easily is evidence that only a physical change has occurred.
