Char da
b
A car uses its brakes to stop on a level road. During this process, there must
be a conversion of kinetic energy into
M

The answer is  a property of density. The higher the density, the higher the pressure at the bottom. 

Pressure = mass / Area. So given that the 4 samples occupy the same area at the bottom, the mass is going to be the determining factor. Per given volume, mercury has the largest mass. The answer is A