Answer:
Julio: ¿Y hay personas bonitas en la piscina?
Step-by-step explanation:
This sentence could be completed with many nouns, which could be either concrete - people or objects - or even abstract, such as people's characteristics or actions.
As bonitas is the plural version of the feminine adjective bonita which means pretty, the noun also needs to be plural and feminine.
Therefore, Julio could either say:
¿Y hay personas bonitas en la piscina?
¿Y hay boyas bonitas en la piscina?
¿Y hay actitudes bonitas en la piscina?
Hope this helps! :)