You are at a parade where there are a number of marching bands. you perceive the bands that are all in the same uniforms as being grouped together. the red uniforms are one band, the green uniforms another, and so forth.
you have this perceptual experience because of the law of:

a. simplicity.
b. similarity.
c. familiarity.
d. pragnanz.

The law of similarity

Explanation:

The Law of Similarity is the gestalt Psychology of putting everything together when it displays similar features as such as color, size, orientation and motion. We tend to group all these things and perceive them as similar to each other . A parade is a unified group in motion and who are wearing the same uniform this scenario create similarity when we perceive these groups.

i think it would be   c)   the raw   materials necesarry to produce   goods

i think im right about 70%