Explanation:

- Option 1: Temperature only

Latent heat refers to the heat absorbed or released during a phase change at a constant temperature.

- Option 2: Volume only

Latent heat is not solely concerned with the constant volume. Phase changes can happen at constant pressure or temperature.

- Option 3: Pressure only

While pressure may remain constant during a phase change, latent heat specifically involves constant temperature.

- Option 4: Temperature, volume, and pressure

This is not accurate, as latent heat emphasizes the constant temperature aspect during phase change, without necessitating constant volume or pressure.