Paivio Conducted a Study on Mental Imagery for the Faces

Paivio conducted a study on mental imagery for the faces of clocks. His study demonstrated that

A) individual differences are small, with respect to response latency on clock imagery tasks.
B) high-imagery people have faster reaction times than low-imagery people.
C) the larger the difference between the two angles that were being compared, the slower the decision speed.
D) experimenter expectancy can explain the results of this research.