Linguistic relativity, also known as the Sapir-Whorf hypothesis, suggests that the structure of a language affects its speakers' cognition and worldview. Option A correctly illustrates this concept by indicating that the way a language structures time can influence how its speakers perceive it. Option B refers to the theory of universal grammar, which is a different concept related to the innate structures common to all languages. Option C focuses on the genetic basis of language acquisition, which is unrelated to linguistic relativity. Option D describes language evolution and expansion, which does not directly relate to the cognitive effects of language structure.