WIll give brainiest answer.

Yo compro la pizza para ellos.
For whom is the pizza : ____
Answer : For whom is the pizza : them
Yo ___ compro la pizza.
Answer : Yo les compro la pizza.
Explanation : The Indirect Object in this sentence is "ellos", that is a third plural person, so the Indirect Object Pronoun must agree. Les.
[tex]\textit{\textbf{Spymore}}[/tex]