Which of the following is linguistically CORRECT about languages and dialects?

The correct answer is "There is no well-defined linguistic difference between a language and dialect."

Explanation and Logical Reasoning:

In linguistics, the distinction between a "language" and a "dialect" is largely based on political, social, historical, and geographical factors rather than purely linguistic criteria. From a purely structural and scientific linguistic perspective, every language variety has its own rule-governed grammar, phonology, and vocabulary.

Let's analyze why the given option is linguistically correct and why the other common misconceptions are incorrect:

1. Linguistic Equivalence: Linguists often point out that "a language is a dialect with an army and a navy" (a famous quote attributed to Max Weinreich). This highlights that whether a speech variety is called a "language" or a "dialect" depends more on political recognition, national boundaries, and prestige than internal linguistic structure.

2. Scripts and Writing Systems: The presence or absence of a script or written literature does not determine whether a speech variety is a language or a dialect. Many recognized national languages historically lacked writing systems, and many regional dialects have rich written traditions or can be written using standard scripts.

3. Oral Traditions vs. Literature: Both languages and dialects can have oral traditions as well as written literature. Literature is a cultural product, not a defining linguistic property of speech.

4. Geographical Spread: Dialects and languages both vary across geographical regions. Dialects are usually mutually intelligible variations within a geographic or social space, but mutual intelligibility itself is not a strict line (e.g., Scandinavian languages like Norwegian, Swedish, and Danish are mutually intelligible yet considered separate languages for political reasons).

Therefore, strictly from a linguistic standpoint, there is no single, precise, objective criterion that separates a language from a dialect.