The Following Question Refers to This Phylogenetic Tree, Depicting the Origins

Multiple Choice

The following question refers to this phylogenetic tree, depicting the origins of life and the three domains. Connecting lines indicate instances of gene or genome transfer and time is indicated from left to right. A possible phylogenetic tree for the three domains of life.
If the early history of life on Earth is accurately depicted by the figure, then which statement is most in agreement with the hypothesis proposed by this tree?

A) The last universal common ancestor of all extant species is one individual species.
B) A significant amount of horizontal gene transfer occurred early in the evolution of life.
C) Archaean genomes should not contain genes that originated in bacteria, and vice versa.
D) Eukaryotes are more closely related to archaeans than to bacteria.