Solution

The octopus are the aquatic organisms. They have eight arms and this is the characteristic feature of this organism. They belong to the group of cephalopod mollusc. They are classified in the order Octopoda. The order name means that the organism have eight arms. They have two eyes. they have a beak like structure which is made up of chitin. The body of the organism is bilaterally symmetric.
Thus, the correct answer is option A.