Terminal fees ____ have different rates for international vs domestic flights.

• A. can
• B. will
• C. may
• D. must

Answer: (A)

This sentence is about expressing possibility with a modal verb. It’s not claiming the rates will necessarily be different or that there is a requirement they must be different; it’s simply saying it’s possible for there to be different terminal fee rates for international versus domestic flights.

Using can here conveys that variability exists in how fees are set—different airports or gate areas may price international and domestic services differently, so having different rates is a possible outcome. The other options would push a stronger meaning: will sounds like a definite future fact, must imposes an obligation, and may, while also meaning possibility, often reads as more tentative or conditional. Therefore, can best express the general possibility that the rates could differ.