The correct order of concept formation is:

Sensation
Sensation is the process of receiving information from our senses. It involves the stimulation of sensory receptors in our eyes, ears, nose, tongue, and skin. Sensation allows us to perceive the physical properties of the world around us, such as colors, sounds, smells, tastes, and textures. It is the first step in the process of concept formation.

Perception
Perception is the process of organizing and interpreting sensory information to give it meaning and make sense of the world. It involves the selection, organization, and interpretation of sensory input. Perception allows us to recognize objects, identify their characteristics, and understand their relationships to one another. It is the second step in the process of concept formation.

Generalization
Generalization is the process of applying knowledge or concepts learned from specific instances to new or similar situations. It involves recognizing commonalities and patterns among different objects or events and making inferences based on those patterns. Generalization allows us to categorize objects or events into broader concepts or categories. It is the third step in the process of concept formation.

Discrimination
Discrimination is the process of differentiating between similar objects or events based on specific characteristics or criteria. It involves recognizing differences and distinguishing one object or event from another. Discrimination allows us to identify the unique features or properties of individual objects or events within a category. It is the final step in the process of concept formation.

Explanation of the correct order (Option D)
The correct order of concept formation is sensation, perception, generalization, and discrimination. This order follows the natural progression of how we perceive and understand the world around us. Sensation is the first step, as it involves the reception of sensory information. Perception follows, as it involves the organization and interpretation of that sensory information. Generalization comes next, as it involves recognizing patterns and making inferences based on those patterns. Finally, discrimination occurs, as it involves differentiating between similar objects or events based on specific criteria.

Summary
In summary, the correct order of concept formation is sensation, perception, generalization, and discrimination. This order reflects the natural progression of how we perceive and understand the world around us, starting from the reception of sensory information to the differentiation between similar objects or events based on specific criteria.