A fifty gram block of ice with an initial temperature of –25°C is warmed continually in a sealed container until it becomes fifty grams of water vapor at 125°C. Which of the following transitions requires absorption of the greatest amount of heat energy?
Group of answer choices

warming up the water vapor from 100°C to 125°C

warming up the water from 0°C to 100°C

boiling the water at its boiling point

warming up the ice from –25°C to 0°C

melting the ice at its melting point