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 the inner - thoughts and mental monologues of characters, which is internal dialogue. Authentic dialogue and what characters say are shown through speech bubbles. Background information is usually provided through narration or other visual cues.

Answer:

It illustrates internal dialogue.