We are supposed to replace the italicized phrase in the sentence with a word from Word List 13. Here, the complete sentence is "To Sid's mom, motorcycles and danger are closely related in her mind." Thus, we can replace the phrase as:
To Sid's mom, motorcycles and danger are synonymous.
Something is synonymous to another thing when they represent the same idea or convey the same meaning. A literal example would be the adjectives "bad" and "evil", which possess the same meaning.
However, things can be synonymous in a less literal way. According to the sentence in the question, Sid's mom sees motorcycles and danger as closely related. They both represent the same idea to her. Therefore, they are synonymous.
Words in Word List 13 are:
Learn more about synonyms here:
https://brainly.com/question/26105224
