Ustedes is formal and should be used when talking to someone you’re not so familiar with, like a stranger, or someone that should be addressed with respect, like an elderly person.
Answer: 1. 8:25 a. m. Buchas días
4. 4:15 p.m. Buenos Tardes
2. 11:45 p. m. Buenos Dias
5. 10:45 a. m. Buenos Tardes
3. 7:00 p. m. Buenos Noches
6. 12:20 p.m._Buenos Tardes
Explanation:
The answer is Si and only Si