On Which Entity or Relationship Should One Focus to Answer

Multiple Choice

On which entity or relationship should one focus to answer the question of when the most recent material requisition occurred?

A) Material Requisition event
B) Material Issuance event
C) Fulfillment relationship between Material Requisition and Material Issuance
D) Reservation relationship between Material Requisition and Raw Materials
E) Stockflow relationship between Material Issuance and Raw Materials