Answer:
The right option that could fill the blank in the sentence is:
B. <u>Vas</u>.
- Antonio, ¿qué <u>vas</u> a hacer esta noche?
Explanation:
The translation of the sentence is:
- Antonio, what are you going to do tonight?
The verb used in that sentence is <em>"ir"</em> in the infinitive form, and its conjugation <u>in Present Tense</u> is:
1. Yo <u>voy</u>.
2. Tú <u>vas</u>.
3. Él <u>va</u>.
4. Ella <u>va</u>.
5. Ello <u>va</u>.
6. Nosotros <u>vamos</u>.
7. Vosotros <u>vais</u>.
8. Ellos <u>van</u>.
In the sentence, apparently the person is talking directly to Antonio, which is why the personal pronoun used is <em>'tú'</em>, the reason why the right conjugated form is <u>"vas"</u>.