<span>Nosotros estamos acostándonos ahora.</span>
Correct because it’s talking about more than one person, it’s talking about “us”
Answer:
Not enough points
Explanation: #ballsdeepnosleep
Hay muchos visitantes en el museo - There are a lot of visitors in the museum.
Siglo - century (doesn't match with the sentence)
Exposiciones - expositions (feminine, does not fit in the sentence)
Visitantes - visitors (masculine and makes sense)
Hope it helped,
Happy homework/ study/ exam!