Answer:
a. visiterons
Step-by-step explanation:
Visiter means "to visit"
Découvrir means "to discover"
Voyager means "to travel"
Se loger means "to find accomodation"
Given the context of the sentence, which translates to: "If we arrive at Zermatt before noon, we ___ the Matterhorn museum," visiterons makes the most sense, since it translates to "(we) will visit"