Final answer:
Telephone conversations provide understanding through vocal cues that indicate the caller's mood, unlike other details like height or marital status, which are irrelevant to understanding the message conveyed.
Step-by-step explanation:
Telephone conversations can give the listener a greater understanding of the intended message by conveying the caller's mood. Unlike other details like height, weight, or marital status, the mood of the speaker is reflected in their vocal tone, pitch, and pacing, which are all key components of vocal delivery in communication. These nuances in speech help the listener to interpret the underlying emotions and intentions behind the words, aiding in creating a more engaged and comprehensible conversation.