Differential Reinforcement Schedules

The continuous reinforcement schedules are explained both ratio and interval schedules. If a teacher targets multiple behaviors such as seating on the chair and working on task, or verbal and facial expression, how can the teacher use the continuous reinforcement to make sure that a student is receiving an appropriate delivery of reinforcement to improve his/her performance in both targeted behaviors? And which an appropriate reinforcement procedure would be used for combined behaviors?
For Differential reinforcement schedules, “differential reinforcement is perhaps most common in shaping and treating problem behavior” (p. 51). Is there one of differential reinforcement schedules (DRO, DRA, DRL and DRH) is more effective than others? Why?