What does language involve according to the definitions provided?

Language involves communicating with words and sentences because it is fundamentally about the exchange of information and ideas through a structured system of symbols, including vocabulary and grammar. This communication can take various forms, such as spoken or written language, and it enables individuals to express their thoughts, needs, and emotions clearly and effectively.

While the other choices highlight important aspects of communication, they do not encapsulate the full scope of what language is. Sign language is indeed a valid language system, but it is just one of many forms of language. Listening to instructions and understanding facial expressions are skills related to communication but do not represent language as a structured system of communication themselves. Thus, focusing on the use of words and sentences captures the essence of language as a multifaceted tool for conveying meaning.