dialect is. A. language sounds of particular region. B. only the words spoken by characters. C. the creation of new way of speaking or thinking. D. the way an author structure an idea.

The most accurate option is Dialect is A. language sounds of particular region.

Explanation:

In a wider sense, dialect refers to a variety of language that people speak in a specific region. This variety is usually distinguished from others by grammar, vocabulary and pronunciation features. Therefore, the most accurate answer is A.

"A particular form of a language which is peculiar to a specific region or social group." (Google dictionary). So I would say the answer is A. But C is also a reasonable answer.