Context: Ca n\'t be sure about that , though . One step at a time ... " Andy watched , fascinated , and did n\'t interrupt again . Castin worked with his laptop battery and the elevator \'s wiring , cursing a lot as he went .
Question: Why is Castin so frustrated that he is reduced to cursing ?
Option 0: Castin is unable to stop getting mad at others .
Option 1: Castin is unable to fix the clock .
Option 2: Castin is unable to empathize with others .
Option 3: Castin is unable to understand the electronics .
Answer: 3