Concerning dictionaries and their proper use which one of the following statement is most accurate

B. A syllable us unit of sound

C. dictionary's word entry offers a fixed permanent meaning

D. formal usage of a word is considered colloquial

Concerning dictionaries and their proper use, the statement that is most accurate is B. a syllable is a unit of sound. D is incorrect because informal usage of a word is considered colloquial, and not formal. C is incorrect because meanings of words often change over time. A is incorrect because many foreign words exist in the English dictionaries, such as garage, or gesundheit, etc.