Which quality of a sound hypothesis suggests that it should be straightforward and uncomplicated?

The quality of a sound hypothesis that suggests it should be straightforward and uncomplicated is parsimony. Parsimony, often associated with Occam's Razor, advocates for simplicity in scientific explanations. A parsimonious hypothesis avoids unnecessary complexity and explains phenomena using the fewest assumptions or variables possible. This makes the hypothesis more elegant, easier to understand, and allows for clearer interpretation of results.

Falsifiability refers to the ability of a hypothesis to be proven wrong through evidence, which is essential for scientific testing but does not inherently speak to simplicity. Testability implies that a hypothesis can be empirically tested and measured, focusing on the feasibility of investigation rather than on its straightforwardness. Rationality concerns the logical coherence and sound reasoning behind a hypothesis but does not specifically address how simple or complicated the hypothesis is. Therefore, parsimony is the best fit for the quality related to being straightforward and uncomplicated.