In Order to Avoid Scale Attenuation Effects, a Memory Test

In order to avoid scale attenuation effects, a memory test should be constructed in which

A) pilot subjects score near the top of the scale when there is no experimental manipulation so that negative effects on scores can be observed.
B) pilot subjects score near the bottom of the scale when there is no experimental manipulation so that positive effects on scores can be observed.
C) pilot subjects score near the middle range of the scale when there is no experimental manipulation so that any effect on scores, whether positive or negative, can be observed.
D) pilot subjects are not aware of the experimental manipulation.