El Futuro Próximo expresses an action in the immediate future in almost the same way we use going to + infinitive in English:
Look at these sentences:
NB: Always include the 'a'.
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Q&A Forum 2 questions, 2 answers
Future tense in Spanish
Yes, it would be pretty much the same, but what we are testing in this question is conjugation of "El Futuro Próximo" (going to) as the hint is stating: "Conjugate "salir de" in El Futuro Próximo"
We can only accent "vamos a salir" in this case.