B, as can be seen from the image, when water boils, the temperature is constant, which is 96℃, so the boiling point of water at this time is 96℃, which is incorrect;
C, water in the process of boiling, constantly absorb heat, this option is correct;
D, the boiling point of water under standard pressure is 100℃, and the boiling point of water in this experiment is 96℃, so the pressure in the experiment is lower than the standard pressure, which is incorrect.
So choose C.