Since only colloidal solutions can show “Tyndall effect”; thus milk and starch solution is the correct option.

To demonstrate “Tyndall effect”:

(i) Milk:

● Pour the milk in a transparent container.

● Then take a torch and allow the light particles to pass through the milk particles.

● As the light particles come in contact with the milk particles, you will see, that the light particles gets scattered.

● This effect is known as the “Tyndall effect”.

(ii) Starch Solution:

● Pour the starch solution in a transparent container.

● Then take a torch and allow the light particles to pass through the starch particles.

● As the light particles come in contact with the starch particles, you will see, that the light particles gets scattered.

● This effect is known as the “Tyndall effect”.