Question

what is the main purpose of a thought bubble in a graphic novel? it displays authentic dialogue. it shows what the characters say. it gives background information. it illustrates internal dialogue.

Explanation:

Thought bubbles in graphic novels are used to convey a character's inner thoughts, which is internal dialogue. Authentic dialogue and what characters say are shown through speech bubbles. Background information is usually conveyed through narration or other means.

Answer:

It illustrates internal dialogue.