In the Context of Perceptual Organization, Which of the Following

In the context of perceptual organization, which of the following statements is true?  

A) According to the law of continuity, elements seen moving together are perceived as belonging together. 
B) According to the law of proximity, we perceive similar objects as belonging together. 
C) Bottom-up processing is the use of contextual information or knowledge of a pattern to organize parts of the pattern at a given point in time. 
D) When figure-ground relationships are ambiguous, or capable of being interpreted in various ways, our perceptions tend to be unstable and shift back and forth.