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 .
Why is Castin so frustrated that he is reduced to cursing ?
Pick the best answer from the following options:
- Castin is unable to fix the clock .
 - Castin is unable to stop getting mad at others .
 - Castin is unable to fix the wiring .
 - Castin is unable to empathize with others .


Castin is unable to fix the wiring .