Expiry	Bid	Ask	Open	High	Low	Settlement
March	54.05	54.10	54.20	54.85	53.52	54.07
June	54.07	54.12	54.23	54.25	53.52	54.10
September	56.08	56.13	54.50	57.85	55.25	56.10
December	55.25	55.30	56.10	56.56	54.21	55.27

For the June contract what price will be used to calculate the margin account balances?

A.	54.10
B.	54.12
C.	54.50
D.	57.85