Answer:
D:colloids
Step-by-step explanation:
Option D is correct. Tyndall effect is the scattering of light shown by microscopic particles in colloids.
Option A is incorrect. Suspensions have larger particles that are visible to the naked eye and in they eventually sediment. They do not show Tyndall effect.
Option B is incorrect. Liquids solutions have no fine suspended particles in medium to scatter light.
Option C is incorrect. Tyndalls do not exist.