One simple little duck the size of his palm took the better part of a half hour for Zack to complete , because his hands could only move so slow , and he stopped frequently to just stare at the folded mess scattered around his crossed legs and the tangled blankets . Messy , messy , he made everything a mess . And then he 'd paused again , losing the battle against self pity as his blank eyes stared at the six paper ducks around him . No , no , no . That was bad , he was n't supposed to think about that .

Question: Why is Zack having difficulties building the paper duck ?
Answer: None of the above choices .Zack does not like this activity and is sulking on his bed .Zack is impatient and can not follow the instructions .Zack is sick and can not move his fingers with dexterity . .