Jack Has a Ticket to See Bo Bice for Which

Jack has a ticket to see Bo Bice for which he paid $30 yesterday. He takes an unpaid day off from work to get ready for the concert. When he arrives at the concert, five different people offer him $70 for his ticket. Jack decides to keep his ticket. The cost to Jack of seeing Bo Bice is:

A) $30.
B) $40.
C) $70.
D) $70 plus his forgone earnings.