Explanation
The correct completion of the proverb "Don't judge a book by its..." is:
C) Cover
Explanation: The complete proverb is "Don't judge a book by its cover." This proverb advises against forming opinions or making assumptions about something or someone based solely on their outward appearance. It suggests that one should look beyond the surface or initial impression and take the time to explore or understand the true nature, qualities, or content before making a judgment. The "cover" refers to the outer appearance or surface of a book, but in this context, it represents any external or superficial aspect that should not be used as the sole basis for evaluation.
