Which of the Following Is a Difference Between Fixed Interval

Which of the following is a difference between fixed interval reinforcement schedules and fixed ratio reinforcement schedules?

A) Fixed interval reinforcement schedules are a type of continuous reinforcement schedules, whereas fixed ratio reinforcement schedules are a type of intermittent reinforcement schedules.
B) With fixed interval reinforcement schedules, a consequence follows every instance of a behavior, whereas with fixed ratio reinforcement schedules, consequences are delivered following a specific number of behaviors.
C) Unlike fixed interval reinforcement schedules, fixed ratio reinforcement schedules are based on behaviors.
D) Unlike fixed interval reinforcement schedules, with fixed ratio reinforcement schedules, consequences are delivered after a specified time has elapsed.