The correct answer is C. 0.6 liter.
Distemper is a type of paint that is made from a mixture of water, pigment, and a binder. The amount of water that is used to mix distemper will vary depending on the desired consistency of the paint. For a smooth, even finish, it is recommended to use 0.6 liters of water for every 1 kg of distemper.
Option A, 0.2 liters, is too little water. This would result in a thick, uneven paint that is difficult to apply.
Option B, 0.4 liters, is a good starting point for most applications. However, if you are looking for a thinner consistency, you may want to add more water.
Option C, 0.6 liters, is the recommended amount of water for a smooth, even finish.
Option D, 0.8 liters, is too much water. This would result in a thin, runny paint that is difficult to control.