Shepard and Metzler Varied the Orientation of One Picture Relative

Shepard and Metzler varied the orientation of one picture relative to the other.That is, in some cases, they were perfectly aligned, but in other sets, they were as much as 180 degrees off from each other.They then asked participants to determine if the figures were identical.They then measured:

A) whether the participant could recall the figure later.
B) if one figure implicitly influenced the perception of the other.
C) if propositional codes were actually analog.
D) how long it took participants to decide if the figures were identical.