Answer: B) Guglielmo Marconi perfected a type of radio technology.
Explanation: active voice is a form or set of forms of a verb in which the subject is typically the person or thing performing the action and which can take a direct object. From the given options, the sentence that has a verb in the active voice is the corresponding to option B: Guglielmo Marconi perfected a type of radio technology, because the subject (Guglielmo Marconi) is the one performing the action, and it can take a direct object which is "a type of radio technology."
