Imagine that you are looking at a geometric drawing. at first, one shape in this drawing seems to be in front of other shapes. the next moment, this same shape seems to be located behind a second shape. this phenomenon is called:
a) depth perception.
b) an illusory contour.
c) an ambiguous figure-ground relationship.
d) holistic recognition.

An ambiguous figure-ground relationship.  

Explanation:

This is a Gestalt principle that is applied for most of the space figure-ground. Everything in the design will be seen as one or other and the relationship between them is mutually exclusive. Neither one has perceived except f another relation. The changing is not possible without changing others. They both are interdependent and complementary to each other. The figure-ground relation can enhance and detract from each other and organized the two as these are in relationships that are the most important aspects of the figure-ground relation. It sets a context for how your design communicates and can be interpreted. It is visual perception. A form is always seen in the relation of the ground. For example a letter to a page, a building with its site, etc. A black shape on the black background not visible, without separation and contrast the forms are not visible.

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long