Answer:
The correct answer is Ovis aries.
Step-by-step explanation:
In a phylogenic tree the closely related species are identified on the basis of most number of common ancestors. The species sharing the maximum number of the common ancestors are said to be closely related. They exhibit more genetic similarity as well as physical traits. In the given phylogenetic tree, Ovis aries and Bos taurus share a same ancestors as compared to others. Hence, they are most closely related.