Actually the correct answer is D. tendrá. Because A would be if you were talking about yourself. B would be if you were taking about a group including yourself, and C would be right if you were talking about a group not including yourself.
<h2>Hello!</h2><h2>

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Answer:
1. Tú <u>modelas</u>.
2. Yo <u>corro</u>.
3. Sara y Ana <u>modelan</u>.
4. Usted <u>corre</u>.
5. Ustedes <u>corren</u>.
6. La gente <u>modela</u>.
7. Marcos y yo <u>corremos</u>.
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Greetings 
Sincerely: <em><u>anapaulacbellido</u></em>
Need help with this Spanish please please