imagery evokes the five senses (sight, sound, taste, smell, and touch) to add detail or create a more believable story. imagery is all about describing things in a way that a person can clearly imagine them. my go-to memory aid for this is related to fairs--you see lights, you hear screams, you taste cotton candy, you smell fried food, you touch soft stuffed animals. these are all forms of imagery to describe the sensation of attending a fair.
consider the word "sensory" in itself--it nearly has the word "sense" in it, and that's how you can remember that it's related to the five senses, and you use the five senses to imagine the way a place feels (IMAGine, IMAGery).
furthermore, syntax is concerned with word order and irony is when something occurs that is the complete opposite of what you expect. those are two answers you could have ruled out to help you narrow it down to imagery as your answer.
