The correct answer is option 4 - reptilians. Reptiles are a type of vertebrate animals that typically have scales, breathe air, and lay hard-shelled eggs. They are characterized by their ability to creep and crawl, as they have adapted limbs that allow them to move on land. This distinguishes them from options 1, 2, and 3. Mammals, option 1, are animals that typically have fur or hair, and most of them walk or run on limbs. Amphibians, option 2, are vertebrate animals that can live on land and in water, but they typically move by hopping or swimming. Mollusks, option 3, are invertebrate animals that have soft bodies and typically move by gliding or using their muscular foot. So, the correct option for vertebrate animals that creep and crawl is reptilians or reptiles.