To answer this question accurately, I would need to see the graph you are referring to. However, based on typical phase change graphs for water (like the heating curve of water), I can provide general guidance:
- Portion C would typically represent a phase change (like melting or boiling).
- If portion C corresponds to a phase change (for example, boiling), then the temperature remains constant while the energy (heat) is increasing.
Therefore, if portion C represents a phase change where the temperature does not change but energy is added (like water boiling to steam), the best statement would be:
The energy is increasing, but the temperature stays the same.
If the portion C represents a region where temperature is increasing (like heating water when it's still in the liquid phase), then the best statement would be:
The energy is increasing, and temperature is also increasing.
You can determine the correct answer based on the context of your graph. If you can provide more details, I can assist you better!