Which prefix indicates something that is false?

The prefix "pseudo" is derived from the Greek word "pseudes," which means false or deceptive. This prefix is commonly used in various fields, including science and philosophy, to indicate that something is not genuine or true. For instance, terms such as "pseudonym" (a false name) and "pseudoscience" (claims or beliefs mistakenly regarded as being based on scientific method) leverage this prefix to convey their inherent falseness.

The other choices represent different meanings: "tetra" refers to four, often used in contexts like "tetrahedron," "supra" means above or beyond, and "arth" is related to joints or jointed structures. Each of these prefixes has specific definitions that do not align with the concept of falseness. Thus, "pseudo" effectively conveys the idea of something being false, making it the accurate choice.