It can be inferred from the passage that economic theory as it presently stands would most likely apply to which of the following situations（）

A．A parliamentary system, where senior members vote by secret ballot.
B．An arts guild, where voting authority is determined by the level of skill at a craft.
C．A fan club, where a president elects other members of the club.
D．A board of trustees group, where all members vote to make company decisions.
E．A monarchy, where a king consults his vassal lords before making decisions.