Answer: Option (A) is the correct answer.
Step-by-step explanation:
A chemical change is defined as the change which leads to change in chemical composition of a substance.
During a chemical change there occurs formation of a new substance.
For example, in picture 1 when pipes are exposed to air for a few months then color of all the pipes changed. This shows that oxidation has taken place that is, it is a chemical change.
On the other hand, in picture 2 liquid state of water changes into solid state that is, formation of ice takes place. As state of matter is changing and no formation of any new substance occurs so it is a physical change.
Thus, we can conclude that the statement picture I shows a chemical change, because a new substance is formed, correctly describes one of the changes.