"It emphasizes that cold, like heat, can create a sharp, painful sensation that feels like a burn."
There’s no context no one can answer this
The sentence in the excerpt that includes the writer's personal opinion is 3. It was unfortunate that Paine called for action.
The other sentences are just plain facts, there are no opinions there, because they are objective. But sentence #3 clearly states what the author thinks about Paine's actions.
