Step 1: Understanding Body Language.
Body language includes non-verbal cues such as facial expressions, gestures, and the use of space. It refers to all forms of communication that do not involve words.
Step 2: Analyzing the options.
(A) Facial expressions: Incorrect. Facial expressions are a critical component of body language as they convey emotions and reactions.
(B) The use of space: Incorrect. The use of space, also known as proxemics, is an important part of body language that helps communicate relationships and boundaries.
(C) Clarity of speech: Correct. Clarity of speech refers to verbal communication and does not fall under body language, which focuses on non-verbal cues.
(D) Gestures: Incorrect. Gestures are a key part of body language, helping to emphasize or convey meaning without words.
Step 3: Conclusion.
Therefore, the correct answer is (C) Clarity of speech, as it is not a part of body language.
Final Answer: Clarity of speech.