Answer:
Step-by-step explanation-
A suspension is a heterogeneous mixture of a fluid that contains solid particles sufficiently large for sedimentation.
Particles are big enough to be visible to the eye and eventually with time they settle to the bottom of the container. The maximum amount of solute can be separated through physical methods like filtration.
In the mentioned cases all of them except salt in water are suspensions since the particles of each of them are big enough and do not get dissolved in water easily and can be separated from the mixture.