Correct Answer - Option 3 : Beefy
Option1. Believe → I does not come after L in alphabetical order. So, the letters are not in alphabetical order.
Option2. Cease → A does not come after E in alphabetical order. So, the letters are not in alphabetical order.
Option3. Beefy → All the letters are in perfect alphabetical order.
Option4. Aerious → I does not come after R in alphabetical order. So, the letters are not in alphabetical order.
Therefore, the word 'Beefy' has its letters in alphabetical order.