Speech balloons, also known as speech bubbles, dialogue balloons or word balloons, are a graphic convention used most commonly in comic books, comics and cartoons to allow words to be understood as representing the speech or thoughts of a given character in the story or events of the graphic novel or Comic.
According to the information presented before I would conclude that the main purpose of a speech bubble in a graphic novel is:
D) It illustrates internal thoughts.
There once was a kid named John. He was a young and adventurous kid. One day he went into the forest. He was sort of peculiar about it. His friends told him stories that there was a witch who made kids like him disappear. He wanted to prove them wrong that there wasn’t a witch. He soon came across an old, creaky house. He went inside, trying not to make a sound. He tried to see what was inside with his flash light. As soon as he turned around, he saw something dash across the hallway. He was curious. It looked like a dog to him. He went into the room that the thing went it. The witch was standing there, waiting for him. He grabbed John and tied him to the chair. She was stirring a potion. John was trying to yell for help, but he couldn’t. He was too deep into the forest. The witch forced him to drink the potion. Then … POOF! He disappeared, and John was never to be seen again.
It is the letter A because you are analyzing an object or a thing.
HOPE THIS HELPS!!!!