What Determines Whether Contrast or Assimilation Effects Will Occur

What determines whether contrast or assimilation effects will occur?

A) Assimilation is more likely to occur when cognitive load is low.
B) Assimilation is more likely to occur when information is processed at a
Superficial level.
C) Contrast is more likely to occur when there is no relevant context information
Available.
D) Contrast is more likely to occur when we don't know the person being evaluated.