Concept:The labelled part shows the strands that join adjacent cells in a colonial organism.Explanation:In Volvox and similar volvocacean algae, neighbouring cells are linked by fine strands of cytoplasm.These strands, called cytoplasmic connections or bridges, allow the cells to communicate and work together.The part labelled II refers to these connecting strands, not to the outer pellicle, the flagella, or the cells themselves.Answer:B. cytoplasmic connections
