If the spot price of the euro is $1.10 per euro and the 30-day forward rate is $1.00 per euro, and you believe that the spot rate in 30 days will be $1.05 per euro, then you can try to maximize speculative gains by ( )
选项：

A:buying euros in the current spot market and selling euros in 30 days at the future spot rate.
B:signing a forward foreign exchange contract to sell euros in 30 days.
C:signing a forward foreign exchange contract to sell dollars in 30 days.
D:buying dollars in the spot market and selling the dollars in 30 days at the future spot rate.