How long had they been talking in the bunker?

Choices:
A. gew minutes
B. few hours
C. few days
D. not enough information
few hours
The young man (boy, really) played with his fingers in the garish light cast from the lone bulb in the concrete bunker. He scratched at an imaginary itch on his right hand (just below his thumb) to take his mind off the man in the lab coat who sat across from him at the beaten, scarred, wood table. It didn't work. And whoever this man in the lab coat was, he was insistent about paperwork. He had three inches clipped onto a weathered clipboard which he flipped through with precision.
"Can I offer you a glass of water?" asked the boy's captor in a calm, sensitive tenor.
The boy, Kurt, continued to scratch the imaginary itch, which had leapt magically from his right hand to the left. Eventually the falseness of the itch would be deduced, and the lab coated man would disappear out of the cell and return with... God knows what. He had seen torture hundreds-if not thousands-of times on TV, and he was glumly certain that there would be no commercial breaks for him.
"Can I offer you a glass of water?" The question was repeated without urgency, like a forgetful waiter. The itch now leaped with the dexterity of a trained flea onto the boy's leg, and the dutiful fingers followed.
He watched as the man in the lab coat, without name tag or company insignia, studied his stack of papers attached to the clipboard. Several yellow forms near the top half inch were labeled 27B. The man frowned and wrote a note on the top page. "Note: Find out who isn't duplicating 27B in Pink."
"I'm sorry," he said, "I wasn't listening. Was that a yes or no to the water?"
Kurt remained in his chair, almost motionless, except for the itching-and-scratching routine. It had leapt again, this time onto his scalp, and the twitching fingers followed. He wondered how long he could keep this up without drawing blood.