Answer: C. premier
Explanation:
"Premier" has the most dominant connotation, because it means "first in line", "first among others", "first of many", "the first".
Premier is used to suggest how important or special someone is - it is used to make someone or something distinguishable among others.
The other words express traits of personality too ("clever", "discerning", "subtle"), but the word "premier" definitely is stronger, because it distinguishes someone's qualities and traits from someone else's qualities and traits, by making that person "the first".
