Identify the set of mixtures.

Correct option is D

The correct answer is Sand, tap water, blood, air.
Homogenous Mixtures:
Those mixtures in which the substances are completely mixed together and are indistinguishable from one another are called homogeneous mixtures. A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Many homogeneous mixtures are commonly referred to as solutions. Some examples of homogeneous mixtures (or solutions) are Sugar solution, Salt solution, Copper sulfate solution, Seawater, Alcohol and water mixture, Petrol and oil mixture, Soda water, etc.
Heterogeneous mixture:
A heterogeneous mixture is a mixture with a non-uniform composition that contains components in different phases. The composition varies from one region to another with at least two phases that remain separate from each other, with clearly identifiable properties. Heterogeneous mixtures contain particles that retain their chemical properties when they are mixed and can be distinguished after they are mixed. The components of heterogeneous mixtures can be separated by the filtration of chemical procedures. The two types of heterogeneous mixtures are suspensions and colloids.
• Sugar and sand form a heterogeneous mixture. If you look closely. you can identify tiny sugar crystals and particles of Sand. Sand is a solid substance. Tap water is a liquid substance.
• Blood is a complex mixture of cells, proteins, and other components found in animals. Air is a gaseous mixture primarily composed of nitrogen, oxygen, carbon dioxide, and other gases.