Which of the Following Has Been Found in Studies of Response-Outcome

Which of the following has been found in studies of response-outcome relations and reinforcement?

A) Operant behaviour is automatically strengthened when it is followed by desirable consequences.
B) On concurrent schedules of reinforcement, organisms emit responses that maximize the total number of reinforcers they will receive.
C) There are species-specific predispositions to form certain types of associations.
D) People actively reason out the relations between responses and the outcomes that follow.