The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labelled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species. 
-Which of the five species, labelled V-Z, is the common ancestor of the fewest number of species?
Definitions:
Big Five Factors
A model describing five broad dimensions of personality: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism.
16 PF
Refers to the 16 Personality Factor Questionnaire, a psychological assessment tool designed to measure a wide range of personality traits.
16 PF
A personality test that measures 16 primary traits or factors of human personality.
L-Data
Life record data in personality and psychological research, which is derived from observations of a person's real-world behaviors or situations.
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