Which of the following is an example of Phylum Mollusca of the animal kingdom?

Octopus

The correct answer is Option (1) - Octopus

Out of the choices you provided, the example of Phylum Mollusca of the animal kingdom is:Octopus

Here's why the other options are not mollusks:

• Sea horse: Sea horses belong to the phylum Chordata, which includes animals with backbones. Sea horses are bony fish and lack the soft body and other characteristics of mollusks.
• Dolphin: Dolphins are mammals and belong to the phylum Chordata as well. They have warm blood, breathe air, and give birth to live young, unlike mollusks.
• King crab: King crabs are not true crabs and belong to the phylum Arthropoda. Arthropods have a hard exoskeleton and jointed legs, which are distinct features not found in mollusks.

Octopuses, on the other hand, are classic examples of mollusks. They have a soft body, a mantle that secretes a shell (which may be internal or absent in some species), and a muscular foot for locomotion. They are intelligent invertebrates known for their eight arms and problem-solving abilities.