Which one of the following is monogamous?

1. The question asks which of the listed animals exhibits monogamous behavior, meaning they typically form a pair bond with one mate for a breeding season or longer. 2. Wolf (Canis lupus) (Option A): Wolves typically live in packs with a dominant breeding pair. This pair often forms a long-term, essentially monogamous bond, usually mating for life, although other pack members may sometimes breed. 3. Walrus (Odobenus rosmarus) (Option B): Walruses are polygynous, with dominant males establishing harems and mating with multiple females during the breeding season. 4. Seal (Pinnipedia) (Option C): Most seal species are polygynous, with males competing for access to multiple females (e.g., elephant seals). Some smaller species might be serially monogamous for a single season, but polygyny is more common. 5. Deer (Cervidae) (Option D): Most deer species are polygynous, where males (stags/bucks) attempt to mate with multiple females (does/hinds) during the rutting season. 6. Among the options, the wolf is best known for forming long-term monogamous pair bonds within its pack structure.