Answer :
Out of the options you provided, the correct answer would be B. "But he stepped out briskly, breathing deeply of the cold air" is not strictly factual because it does not contain a specific time, location, date or object!
The correct answer is B.
Fermi was given the task of creating the first self-sustaining nuclear chain reaction. But there was a possibility that things could get out of control. The title of this story is the coded telephone message confirming first self-sustaining nuclear chain reaction on that day. On that afternoon, the Atomic Age began inside an enormous tent on a squash court beneath the stands of the University of Chicago’s Stagg Field.
