______ was/were a simple apparatus, invented by B.F Skinner, which permitted a pupil to read a brief passage, answer questions and then, by turning a knob, to see if the pupil was correct.I. teaching machineII. learning machine

______ was/were a simple apparatus, invented by B.F Skinner, which per

1.	______ was/were a simple apparatus, invented by B.F Skinner, which permitted a pupil to read a brief passage, answer questions and then, by turning a knob, to see if the pupil was correct.I. teaching machineII. learning machine
A.	Only II
B.	Both I and II
C.	Only I
D.	Neither I nor II
Answer» D. Neither I nor II