\ extbf{Correct option:} Option B \ extbf{Explanation for correct option:} Option B: \\bullet Animal kingdom is broadly categorized into two groups - invertebrates and vertebrates. \\bullet Vertebrates are the organisms that show the presence of a vertebral column while the invertebrates do not have a vertebral column. \ extbf{Explanation for incorrect options:} Option A: Vertebrates are organisms that have vertebral column.Option C: Algae do not belong to the kingdom Animalia and hence is not an animal. Instead, it belongs to the kingdom Monera.Option D: Viruses have not been classified under any of the kingdoms in Whittaker's five kingdom classification system and hence, is not an animal. \ extbf{Conclusion:} Invertebrates are the animals that do not possess a vertebral column.