Read the following context and choose the best option to answer the question.
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 did Andy watch ?
Options: 
A. He was fascinated .
B. He was curious about all the cussing .
C. Because Castin worked with his laptop .
D. Because of the elevator 's wiring .


A