What is the primary function of speech?

The primary function of speech is to express thoughts, ideas, and emotions through verbal communication. This form of communication enables individuals to articulate their internal experiences and share them with others, facilitating social interaction and meaningful conversations. Speech allows for the transmission of complex concepts and feelings that might be difficult to convey through other means.

While non-verbal signals, such as gestures and facial expressions, play an important role in communication, they are not the primary function of speech. Understanding body language is also significant, but it falls under non-verbal cues rather than the verbal expression that speech provides. Teaching vocabulary and grammar is important for language development but is not a direct function of speech itself; rather, it's a process that supports effective verbal communication. Thus, option B accurately encapsulates the key purpose of speech in human interaction.