Ingrid Has Been Waiting for the Show "Mamma Mia!" to Come

Ingrid has been waiting for the show "Mamma Mia!" to come to town.When it finally does come,ticket prices are $60.Ingrid's reservation price is $75.But when Ingrid tries to buy a ticket,they are sold out.
Refer to the information above.Ingrid decides to try to buy a ticket from a scalper (a person who has purchased extra tickets at the box office with the intent to resell those tickets) .If Ingrid finds someone who is willing to sell her a ticket for $70,she should:

A) not purchase it because it is overpriced by $10.
B) not purchase it because the cost to the scalper was only $60,and it is unfair of the scalper to take advantage of the ticket shortage.
C) purchase it because to do so will lead to an increase in surplus.
D) purchase it even though it is not surplus-enhancing.