The correct answer is B. They wanted to experience some of the area's outdoor adventures.
Step-by-step explanation:
In grammar, an infinitive refers to a basic form of verbs that are created by the preposition "to" followed by a verb that has not been modified or conjugated. Additionally, in English language infinitives are placed after other verbs such as propose, aim, afford, among others. Considering this, the sentence with an infinitive is "They wanted to experience some of the area's outdoor adventures" as in this sentence "to experience" is composed by the preposition "to" followed by the bare form of the verb "experience" and therefore, these two words are an infinitive. Additionally, this is the only case from the options provided in which the preposition is followed by a verb to form an infinitive rather than followed by a noun which does not form an infinitive.