Answer:
The correct answer is D. Seals and penguins.
Step-by-step explanation:
In every sentence that refers to an action carried out by one or more people, animals, things, etc., the subject is who or who performs the action, while the predicate is the verb and the components of the sentence that relate to it. Therefore, since the sentence is performed by the seals and penguins, this option is the correct option.