Answer: Option (c) is the correct answer.
Step-by-step explanation:
When a substance changes position of its atoms from one state to another then it means no change in chemical composition has occurred.
For example, melting of ice at room temperature.
These type of changes when no change in chemical composition occurs are known as chemical changes.
Hence, we can conclude that when 15 grams of liquid plastic is frozen then its volume increases but it will still weigh 15 grams.