There is enough evidence that someone has committed a crime serious enough to warrant being taken into custody (police detention).

Preliminary hearing
Arrest
Initial appearance
Arraignment
Plea bargaining
Booking
Grand jury indictment

Trial

Sentencing
Appeal
Probation
Parole
Prison or jail incarceration

so which option is it

Based on the information provided, the next step after there is enough evidence to suggest that someone has committed a crime serious enough to be taken into custody (police detention) would typically be the arrest of the individual. This would be followed by the booking process, initial appearance before a judge, and then the arraignment where the formal charges would be presented to the defendant. Plea bargaining may also occur at some point in the legal process, depending on the specifics of the case.