The correct statement is: When ice melts, it absorbs energy.
To clarify the other statements:
- When water boils, it actually absorbs energy (it requires heat to turn from liquid to gas).
- When water freezes, it releases energy (it releases heat to the environment as it transitions from liquid to solid).
- When a gas condenses to a liquid, it releases energy (the process of condensation involves the release of heat).
Thus, the true statement among the options given is that when ice melts, it absorbs energy.