The given analogy is:

Augur: Future =>  An augur is someone who predicts or foretells the future.

A) Knight: Medieval → A knight is associated with the medieval period but does not predict it.

B) Poet: Century → A poet belongs to a century but does not predict it.

C) Vanguard: Pack → A vanguard leads a group (pack), but this is about leadership, not prediction.

D) Historian: Past → A historian studies and analyzes the past, just as an augur study signs to predict the future. (Correct)