I believe the answer is the first choice, which is motion.
I believe the correct answer is exercitui.
You need the perfect passive form here, which is formed when you combine the verb esse in the present tense (here, sunt because of third person plural), and the appropriate participle in the same person, which in this case is exercitui - third person plural.
It’s ok, we all make mistakes. You’re not the only one! Have a great day!
It was Greek. It was a Ancient Greek fabulist or story teller.
