Mark the correct statement
(a) Particles in a suspension have a tendency to settle down.
(b) Particles in a suspension can be seen with naked eyes.
(c) Particles in a suspension can't be seen under a simple microscope.

Particles in a suspension are of size $10^{-7}m$ or more and can be seen with naked eyes or under a simple microscope. The suspension is a non-homogeneous mixture. The particles of suspension are sufficiently large for sedimentation and have a tendency to settle down.