Bonjour pouvez vous m’aider à faire cette exercice svp

68 Choisis le pronom relatif qui convient.
a. People underestimated the influence
who / that video games have on young people.
b. We still don't know the exact moment
where/ when the riot started.
c. Did they arrest the person that/ which set the
building on fire?
Astuce!
Commence par repérer l'antécédent du pronom
relatif.