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 show what characters are thinking, which is internal dialogue. They are not for authentic spoken - dialogue, what characters say (which is shown in speech bubbles), or background information.

Answer:

It illustrates internal dialogue.