Explanation:

- Particular (Option 1): Refers to something specific and distinct. Saying "the particular country" makes sense because it specifies the country where the language is spoken. This is the correct choice.

- Peculiar (Option 2): Means strange or unusual. Using "peculiar country" implies that there's something odd about the country, which is not the intended meaning.

- Special (Option 3): Indicates something unique or exceptional. Although somewhat positive, it doesn’t convey the idea that’s required, which is defining the country where the language is spoken.

- Definite (Option 4): Means clearly defined or certain. "Definite country" doesn’t fit well, as it doesn’t naturally describe a country where a language is spoken.