Which excerpt from The Number Devil best shows that one purpose of Robert's character is to oppose the number devil?

“You sound as though you never went to school. Or maybe you are a teacher yourself?”
"How dumb can you get!" said Robert. "A colossal waste of time if you ask me. So get going! Scram! Shoo!"
"I'm sorry," Robert said meekly, though the whole thing was getting weirder and weirder.
"It's just that all those ones give me a headache. They actually make things more complicated than they are."

"How dumb can you get!" said Robert. "A colossal waste of time if you ask me. So get going! Scram! Shoo!"

Option B

Explanation:

The number devil: A mathematical adventure which is a book who has been written by Hans Magnus. It is a story for children and young adults which talks about exploring Mathematics.

In the story, Robert is a boy who does not like to study math gets to meet a number devil who takes him for the exploration of the world of numbers which was amazing and after that Robert started fascinating about those numbers.

the answer is irony!