Final answer:
A child applying pragmatics in communication can be seen when a five-year-old describes a lion as a big cat when speaking to his younger brother. Therefore, the correct option is C.
Step-by-step explanation:
One example of a child applying pragmatics in communication is when a five-year-old child named Habid describes a lion as a big cat when conversing with his younger brother.
This demonstrates the child's understanding of the appropriate language to use based on the context and the level of comprehension of his brother.
By using simpler and relatable language, Habid is applying pragmatics in his communication.