Detecting..
Please type or get the image closer to the questions because I can't see the questions. After you fix that I can start answering your questions!
Here we have the "Subjonctif Présent" tense introduced by "que" (qu'on). Furthermore, the sentence is expressing an uncertain action: He's not sure if they should go to the healers for the treatment.
Second, we have the pronoun "on" so the verb should come in the singular form.
All in all, we get the third answer: Doive.
"Je ne pense pas qu'on doive aller aux guérisseurs pour le traitement".
Hope this helps! :)
Yang habite en Chine. Il adore peindre toutes sortes de chose. Ce qu’il adore faire aussi, c’est jouer de la musique. Un autre de mes camarades s’appelle Frank. Il vit en France et joue au rugby.