Answer:
It would be "Ellos"
Step-by-step explanation:
~Subject pronouns in Spanish
The same gender rules you learn in "Nosotros" apply.
A group consisting entirely of females should be referred to as Ellas.
Any group with at least ONE male in it should be referred to as Ellos.
It's "Ellos" because "Ellas" is plural for "Girls" only.
Even though "Ellos" is plural for guys, it can also be used for "them" / "they"
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Hope I helped!!!
GL :)