Which of these is true about modifiers?

A- A modifer is a word or phrase used to combine two clauses into a single sentence
B- A modifier gives additonal information
C- a sentence cannot be complete without a modifier
D- Modiferes are always in the dependet clause

B- A modifier gives additional information

Are you sure this correct?

Yes, I am sure that B- A modifier gives additional information is correct. A modifier is a word, phrase, or clause that provides further description or explanation about a noun or verb in a sentence. It adds detail or clarifies the meaning of the sentence.