For an ideal incompressible fluid, which statement about the relationship between its mass m and volume V is correct?
a) m is inversely proportional to V because the total amount of matter is fixed while the fluid expands.
b) m is directly proportional to V because the density remains constant.
c) m stays the same even when V changes, since the incompressible fluid can simply redistribute itself.
d) m grows faster than V because the fluid becomes more dense as more volume is added.