Well most likely D. because you are suppose to use the masculine form with masculine nouns. It can also be C.
1. Primavera
2. Verano
3. Invierno
4. Otoño
5. Verano
6. Verano
7. Primavera
8. Invierno
9. Verano
10. Otoño
The answer to your question will be C
Eres alto translates to you're tall and Usted es alto translates to You are tall.
So I'm going to go with D
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