Explanation:

- Dacoity: This is an offence related to robbery with five or more people. It is punishable at four stages: intention or preparation, attempted robbery, and actual commission, which can also involve conspiracy.

- Murder: Usually punishable primarily at the stage of commission, though conspiracy can also be a separate charge.

- Robbery: It is focused on the act of robbery itself and attempts; less emphasis on preparation or conspiracy beyond usual criminal procedure.

- Rape: Primarily punishable at the stage of commission. Preparation and attempt crimes exist but aren't as distinctly outlined as for dacoity.

Dacoity is the correct answer.