In Comparing the Decision to Detain Someone Pending the Filing

In comparing the decision to detain someone pending the filing of formal charges and the decision to take the case on to trial:

A) the detention decision requires probable cause,while the trial decision requires reasonable suspicion.
B) the detention decision requires reasonable suspicion,while the trial decision requires probable cause.
C) both decisions require reasonable suspicion only.
D) both decisions require probable cause,but less probable cause is needed to justify the detention decision than is necessary to justify the trial decision.