Hello!
The answer is: According to this phase diagrams, when you increase the pressure from 50 kPa to 150 kPa on an ice cube at 0° C, the ice cube melts.
Why?
Since we are increasing the pressure from 50 kPa to 150 kPa on an ice cube at 0° C the melting point of the water will decreases, meaning that the ice will melt.
When an extreme pressure is applied on an ice cube, we are making less space between its molecules, so, the ice cube will melt and not for the effect of the temperature.
Have a nice day!