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: What was Castin doing ?
Option 0: Working on the wiring .
Option 1: Cursing his friend .
Option 2: Buying a D battery .
Option 3: Taking several steps at a time .
Answer: 0