You're right that "neighbouring town" is incorrect. I'm still confused as to why we're assuming "une colline locale" is the countryside.
Hi Cindy. We don't assume that just from "une colline locale". The story says: Elle représentait M. Forestier et une femme âgée, debout près d’un étrange arbre fruitier dans une forêt. Clémentine n’a rien dit. Après le travail, Clémentine est sortie précipitamment. Elle savait où la photo avait été prise, en regardant le paysage en arrière-plan. C’était sur une colline locale qui était très difficile à gravir. We have a description of a forest, the landscape, and a hill that is difficult to climb. Considering this full description, the answer that best describes the situation is that it is in the countryside. The questions are designed to ensure that learners really have to understand the story in order to get the correct answer. A learner who notices the word "colline" in the story and also in one of the answer texts will get it wrong. They are overlooking the wider description, and the false information that the hill is in the next town.
No. The story says it’s a local hill nearby. So “neighbouring town” is incorrect. The correct answer is “in the countryside”.