Which of the following best describes how languages behave over time?

Alanguages change too frequently for new words to become accepted as normal.

Bover time, any given word can disappear from a language or acquire a new meaning.

Cif everyone agrees on what a word means today, it will always mean the same thing.

Dwithin a single language, words often change, but it is rare for any word to cross from one language to another