Margaret brought her lunch today but now a co-worker has asked her to go to the burger joint across the street. Select the correct statement from the following.

		The cost of the lunch Margaret already has is relevant to Margaret's decision to do lunch with her friend.
		The cost of the lunch Margaret already has represents the opportunity cost of dining with her friend.
		The cost to buy lunch at the burger joint is not relevant since it has not yet been incurred.
		Margaret's decision to bring her lunch has nothing to do with her current decision.