Answer:Here’s the answer to fill in the blanks:"Regular reflection is the reflection of light on a(n) smooth surface."If you need it structured with letters A, B, C, D, here’s a possible format:1. A. Key - Regular reflection is the key.2. B. Process - Regular reflection is the process.3. C. Phenomenon - Regular reflection is the phenomenon.4. D. Concept - Regular reflection is the concept.Choose the appropriate term that fits best for your context!