Which Statement About Partial Schedules of Reinforcement Is FALSE

Which statement about partial schedules of reinforcement is FALSE?

A) Variable schedules of reinforcement are more resistant to extinction than fixed schedules of reinforcement.
B) Ratio schedules of reinforcement lead to higher rates of responding than interval schedules of reinforcement.
C) The slope of an interval schedule is flatter than the slope of a ratio schedule.
D) Fixed schedules lead to fewer periods of no responding after reinforcement than do variable schedules.