Who said "The question is: what are you going to do about it?"?

This quote is attributed to Iron Man (The Avengers).

The question is: what are you going to do about it? - Iron Man (The Avengers)

"The question is: what are you going to do about it?"

Iron Man (The Avengers) Motivation

"I am Iron Man."

"Genius, billionaire, playboy, philanthropist."

"If you're nothing without the suit, then you shouldn't have it."

"I've successfully privatized world peace."

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."