Because a call option gives you the right to buy the currency at the current price in the future.

The so-called call option.

If you expect prices to rise in the future, you should definitely buy call options.

When the rising price of money in the future is the same as the price you spend on call options.

You make ends meet

for instance

A The current currency price is 10 yuan, and the call option price is 1 yuan.

If currency A reaches the price of 1 1 yuan in the future.

Your income is 1- 1=0.

You get 1 yuan, and subtract your option cost from the appreciation to make ends meet.