Answer:c- It will still weigh 15 grams
Step-by-step explanation:
Given
Fifteen gram of a liquid plastic are frozen in a physical change that increases the volume.
It is certain that the mass of plastic will remain fifteen grams despite the increase of volume as density of the plastic will automatically adjusted to get same mass
![mass=density * volume](https://img.qammunity.org/2020/formulas/social-studies/high-school/lzkumki5oviuouqqnfmun073l7fow03t1g.png)