Final answer:
The Gestalt principle that involves grouping based on the direction of movement is 'common fate'. This principle is part of Gestalt psychology which deals with how we perceive elements in relation to each other and their surroundings. (Option C).
Step-by-step explanation:
The Gestalt principle that involves grouping based on the direction of movement is common fate. According to the principle of common fate, elements that move in the same direction are perceived as part of a single group.
For example, if several birds are flying in the same direction at the same speed, we tend to see them as a flock, and this moving together implies they share a common fate. Other relevant Gestalt principles include proximity, which suggests that elements close to each other are perceived as a group, as demonstrated in Figure 5.26, where we see one block of dots or three columns based on how close the dots are to each other.
However, proximity involves grouping based on spatial closeness rather than movement. (Option C).