The tendency to perceive a series of points or lines as having unity is the gestalt rule of organization known as

The tendency to perceive a series of points or lines as having unity is the Gestalt rule of organization known as Continuity.                                            

Explanation:

The Gestalt school of psychology which was founded in the 20th century provided the foundation for the modern study of perception. the Gesalt theory emphasizes that the whole of anything is greater than its parts. That is, the attributes of the whole are not deducible from analysis of the parts in isolation.

With respect to sensation and perception, there are several rules which have been identified. They are

Another way to state the law of continuity is to say that once the eye begins to follow something, it will continue traveling in that direction until it encounters another object. A good example is a line with an arrow at the end of it.

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d is the answer i came up with

vapour or gas assuming atmospheriv pressure