Clearly articulating your words on the telephone refers to:

Enunciation refers to the clear and precise pronunciation of words, which is critical in effective communication, especially over the telephone where visual cues are absent. When a person enunciates well, they articulate their words clearly, enabling the listener to understand the message more easily. This skill is particularly important in a medical office setting, where conveying accurate information is vital for maintaining effective communication with patients and other healthcare professionals.

The other terms, while related to aspects of speech, do not specifically address the clarity of pronunciation. Clarity refers to the overall comprehensibility of the message, which encompasses but is not limited to enunciation. Pitch relates to the highness or lowness of a voice and does not inherently indicate how well words are pronounced. Inflection refers to the modulation of the voice when speaking, which can impact the tone and emotional quality of speech but again does not focus on the precision of word articulation. Therefore, enunciation is the most accurate term that captures the essence of articulating words clearly over the telephone.