A substantial similarity test is used to determine whether an ordinary reasonable observer comparing two works would have to conclude that the work being questioned was copied from the other. Hence, Option C is correct.
An observer is a person who keeps a keen eye or always being alert towards paying attention to something. Being an observer, one has to pay attention to current events.
An observer has to apply various kinds of tests for doing the comparative study. One of them is substantial similarity. It is generally used by the court to determine the copyright of the work.
Thus, Option C is correct.
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The complete question is attached in text form:
A(n) __________ test is used to determine whether an ordinary reasonable observer comparing two works would have to conclude that the work being questioned was copied from the other.
goodwill
fair use
substantial similarity
infringement