Which Statement MOST Accurately Expresses the Relationship Between Knowledge-Based and Data-Based

Which statement MOST accurately expresses the relationship between knowledge-based and data-based processing? 

A) Some stimuli are processed in a data-based fashion, whereas others are processed in a knowledge-based manner.
B) The contribution to perception of data-based processes is much smaller than that of knowledge-based processes.
C) Knowledge-based processes only contribute to perception when stimuli are highly unusual, unexpected, or ambiguous.
D) Knowledge-based and data-based processes occur simultaneously during the perception of many, if not all, stimuli.