Final answer:
The shorter the time to the expiration date for a currency, the greater will be the premium of a call option, and the lower will be the premium of a put option, other things equal.
Step-by-step explanation:
The answer to your question is b. greater; lower.
When the time to expiration date for a currency is shorter, the premium of a call option will be greater and the premium of a put option will be lower, other things equal.
This is because a call option gives the owner the right to buy a currency at a specified price, while a put option gives the owner the right to sell a currency at a specified price. As the expiration date approaches, there is less time for the exchange rate to move in a way that would be favorable to the option holder. Therefore, the premium of a call option increases as the time to expiration decreases, since the option becomes more valuable. Conversely, the premium of a put option decreases as the time to expiration decreases, since the option becomes less valuable.