Perception is the process by which we interpret and organize sensory information to give it meaning. It involves not just receiving sensory data, but also understanding and making sense of it. This process goes beyond just transmitting information to the brain or transforming sensory data; it's about interpreting the sensations and making sense of them. The correct option highlights the essence of perception, which is the understanding of sensations.
Step 1: Analyze the options.
(A) Process of sending external information to brain: This is not accurate, as perception involves not just sending information but also interpreting and understanding it.
(B) Transformation of information from sensory organs to Brain: This is part of the process, but it misses the aspect of understanding the information, which is a key element of perception.
(c) Perception is a process of understanding Sensation: This is the correct answer. Perception is about interpreting and understanding sensory information.
(D) Schemas or mental categories which enable us to interpret our objects: While schemas are part of the process of perception, they are not a comprehensive definition of perception itself.
Step 2: Conclusion.
The correct answer is (C), as it captures the essence of perception as understanding sensations.
Final Answer:
\[
\boxed{(C) \, \text{Perception is a process of understanding Sensation.}}
\]