The correct option is B Mollusca
The organisms shown in the image given belong to the Phylum Mollusca, the second largest Phylum in Animal Kingdom. They are referred to as Molluscs due to their characteristic soft and slimy bodies. They are triploblastic, euclomate and non- segmented as well. These animals are either aquatic creatures like the octopus or terrestrial creatures like snails. They have a hard calcareous shell which are either external, internal or even in some cases, absent.