In this excerpt from isaac asimov’s “the fun they had,” what method of indirect characterization is used?

“gee,” said tommy, “what a waste. when you’re through with the book, you just throw it away, i guess. our television screen must have had a million books on it and it’s good for plenty more. i wouldn’t throw it away.”

“same with mine,” said margie. she was eleven and hadn’t seen as many telebooks as tommy had. he was thirteen.

a.
speech
b.
thoughts
c.
effect on others
d.
actions
e.
looks