You can melt ice by applying pressure because the solid/liquid line has a slope.

As we know that in melting process of ice we required to break the strong bonds of water and convert it into  weak bonds. Due to weak strength between water molecules the phase conversion will occur

In this bond strength we know that pressure and temperature has a great role

So here if we increase the pressure and decrease the temperature the bond strength will increase and its phase will convert into solid phase, while if we decrease the pressure and increase the temperature the bond will become weak and it will convert into liquid.

So here we can see the same trend in the phase diagram of water where this variation is plotted against various combination of temperature and pressure

so here correct answer will be

You can melt ice by applying LOW pressure because the solid/liquid line has a NEGATIVE slope.