The correct way to say "at 8 o'clock" is c) a las ocho.
1: Is it explaining? If so in spanish explain is Explicar
2: Watch: Mirar
3: Window: Ventana
4: What are they doing??
5: Money: Dinero
6: Beach: Playa
7: Eraser: Borrador
8: I think its papers, and papers in spanish is Documentos
I think these are right, hope it helps
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C becuase the question is asking which one says 6:40 and c says 6:40