Vous vs tu

Question

A hint in the first question suggests "use vous form" in "votre (oeuvre d'art favorite)". But later, speaking to the same person comes the response "Je suis d'accord avec toi". Is there a reason for what appears to me to be an inconsistency? Same two people speaking.

Accepted Answer

Hi Jack,
In the introduction it says -
Stéphane asks Isabelle, Clémence, and Benjamin what their favourite works of art is, so the 'vous' would be used for this.
The second person to answer ( which is a different voice) agrees with the first responder using the 'tu' form. 
Seems correct to me ...

Answer

Ok, my mistake. I missed that  the first case was plural. Thanks.