Which of the following is a sign of a speech phoneme that can be lip-read?

The correct answer highlights the importance of mouth movements, which are directly related to the articulation of speech phonemes. Lip-reading involves identifying consonants and vowels primarily through visual cues provided by the movement of the lips, tongue, and other facial features. The specific patterns, shapes, and timing of the mouth's movements can convey phonemic information that is critical for understanding spoken language.

While body language and facial expressions play a crucial role in communication by providing context and emotional cues, they do not specifically represent the phonetic sounds of speech. Fingerspelling, often used in sign language communication, pertains to spelling out words letter by letter rather than indicating speech sounds or phonemes. Thus, mouth movements are the primary visual indicators that a skilled lip-reader would focus on to interpret spoken language accurately.