The correct answer is option B) Roots.

Funaria and Selaginella are both plants, but they belong to different groups. Funaria is a moss, which is a non-vascular plant, while Selaginella is a lycophyte, which is a vascular plant. Despite their differences, they do share some similarities.

Embryo:
Both Funaria and Selaginella possess embryos. An embryo is a young multicellular organism that develops from a fertilized egg. It is the earliest stage of development in a plant or animal. The presence of an embryo is a characteristic feature of all plants.

Motile Sperms:
Another similarity between Funaria and Selaginella is the presence of motile sperms. In both plants, the male gametes, or sperms, are flagellated and capable of swimming in a film of water to reach the female gametes for fertilization. This is a common trait in many non-flowering plants.

Archegonia:
Archegonia are structures that produce and protect the female gametes, or eggs, in plants. Both Funaria and Selaginella possess archegonia. These structures are essential for the sexual reproduction of plants.

Roots:
The one characteristic that is not common to Funaria and Selaginella is the presence of roots. Funaria lacks true roots, as it is a non-vascular plant. Instead, it has rhizoids, which are thread-like structures that anchor the plant to the substrate and absorb water and nutrients. On the other hand, Selaginella is a vascular plant and possesses true roots, which play a crucial role in anchoring the plant, absorbing water and minerals from the soil, and providing support.

In conclusion, while Funaria and Selaginella share similarities such as the presence of embryos, motile sperms, and archegonia, the one characteristic that is not common to both is the presence of roots. Funaria lacks true roots, while Selaginella possesses them.