Final answer:
The correct indirect object pronoun is le.
Step-by-step explanation:
The correct indirect object pronoun that completes the sentence is le.
Indirect object pronouns in Spanish are used to represent the person or thing that receives the action indirectly.
In this sentence, the action of making questions is being done to the young people, so the correct pronoun would be le to represent them.
Learn more about indirect object pronouns in Spanish