It’s the third one: a highlighted word
Antonyms are opposite in meaning to another. Some examples are - (good - bad) (agree - disagree) (honest - dishonest) (hot-cold) it’s just any words that are complete opposite from each other and it can be more then one word. If a question were to ask what are antonyms of hot you could say cold, freezing, cool, arctic, frigid, etc
Answer:
She could include more reasons she is hesitant to assist Grandma June, allowing suspense to build as the reader begins to believe she will not help.
Explanation:
I was about to say the last one but then the reader would be confused who Grandma June is more of then having suspense.
