Answer:
If the suffix -ize means “cause to be,” the bolded word that means “cause to be seen” is visualize.
Step-by-step explanation:
As the word visualize has the suffix ize which means "cause to be" it also has the root word vis that means "to see", taking these two references we can say that we have the root word "see" and the suffix "cause to be" which lead as to the definition of "cause to be seen", besides there are some keywords in the excerpt that talks about images such as "looked like".