Final answer:
The active voice sentence is "Hail pelted the roof," where the subject 'Hail' performs the action of pelting, unlike the other provided options which are all in passive voice.
Step-by-step explanation:
The sentence that is in active voice is "Hail pelted the roof." In this sentence, the subject 'Hail' is performing the action of pelting. Unlike the other sentences, where the roof is acted upon and receives the action (passive voice), this sentence has the subject doing the action, making it an active-voice sentence. Recall that active voice is generally preferred because it creates stronger, clearer, and more concise sentences.
To determine if a sentence is in passive voice, look for a form of the verb to be (am, is, are, was, were) along with a past participle (-ed or -en form of the verb). Also, a passive sentence sometimes includes or implies the preposition 'by'. Here, only "Hail pelted the roof." does not fit the criteria for passive voice, as there is no form of 'to be' and 'by' preposition in the sentence.