Which of the following uses active voice? My new dog will be trained by my big brother. The dog food can be eaten by all the dogs at the party. The dog park was used by the neighborhood pet owners. Our puppies played at the cool new dog park.

Our puppies played at the cool new dog park.

Explanation:

The active voice is a morphological grammar voice, that is, an inflectional form of verbs that marks the subject's role in the sentence. Therefore, the active voice indicates that the subject is the one who makes the action in the sentence (that is, is active), in contrast to, for example, the passive voice, where the subject constitutes the object of the action.