Which phrase or sentence in this excerpt from Kurt Vonnegut's "Report on the Barnhouse Effect" demonstrates the use of irony?

One long bench had been brought in for the ten of us privileged to watch. The television screens showed, from left to right, the stretch of desert which was the rocket target, the guinea-pig fleet, and a section of the Aleutian sky through which the radio-controlled bomber formation would roar.

Ninety minutes before H-hour the radios announced that the rockets were ready, that the observation ships had backed away to what was thought to be a safe distance, and that the bombers were on their way. The small Virginia audience lined up on the bench in order of rank, smoked a great deal, and said little. Professor Barnhouse was in his bedroom. General Barker bustled about the house like a woman preparing Thanksgiving dinner for twenty.

At ten minutes before H-hour the general came in, shepherding the professor before him.

A.One long bench had been brought in for the ten of us privileged to watch

B.The television screens showed, from left to right, the stretch of desert which was the rocket target,

C.Ninety minutes before H-hour the radios announced that the rockets were ready, that the observation ships had backed away to what was thought to be a safe distance

D.At ten minutes before H-hour the general came in, shepherding the professor before him

Irony is supposed to be the opposite meaning, right or sarcasm.

Is it A, because they were privileged to watch?

The sentence that demonstrates the use of irony in this excerpt is:

D. At ten minutes before H-hour the general came in, shepherding the professor before him.

The phrase that demonstrates the use of irony in this excerpt is:

C. "Ninety minutes before H-hour the radios announced that the rockets were ready, that the observation ships had backed away to what was thought to be a safe distance."

This is ironic because the announcement about the rockets being ready and the observation ships backing away to a safe distance creates an expectation that something significant and thrilling is about to happen. However, the use of irony suggests that the actual events that follow may not match this excitement and anticipation.

I really don't know the context. I haven't read this story. Were the people "privileged" to watch doing so voluntarily? Were they under orders to watch? Were they doing so willingly? If unwillingly, I would agree. I think D might be the answer, too. The general "shepherding" the professor? What, was the general a border collie shepherding a sheep, or a man with a crook treating the professor like a sheep?