The futures price (with expiration date in 6 months) of an equity index is 1280. The futures contract has a multiplier of 250 (the contract size). A portfolio manager manages a long equity portfolio with a current market value of $20 million. The portfolio has a beta of 1 relative to the equity index. How many units of the futures contract should the portfolio manager buy or sell to make her portfolio risk-free for the next 6 months?
A) Buy 62.5 futures contracts
B) Sell 62.5 futures contracts
C) Buy 75 futures contracts
D) Sell 75 futures contracts