i do believe the answer is the third option because that means They Study! in english and the other ones are not plural.
A synonym can be prefecto, preferir,preferible, etc.
B. “No hice nada” translates to “I’m doing nothing”
“Que estás haciendo” translates to “what are you doing”
Hope this helps
Answer:
Son.
Explanation:
Ellos ____ son ______tres amigos
No pienso aceptar la nueva oferta antes de que mi jefa TENGA la oportunidad de responder.