Which of the following is NOT a method of non-verbal communication used by people with sensory impairments?

Facial expressions are indeed a form of non-verbal communication, but they are primarily visual cues that rely on the observer being able to see them. For individuals with sensory impairments, particularly those who have visual impairments, facial expressions may not be significant or interpretable as a means of communication.

On the other hand, British Sign Language and PECS (Picture Exchange Communication System) are designed specifically for individuals with hearing impairments and other communication difficulties, utilizing visual signs and pictures to convey messages. Braille is a tactile writing system used by those who are visually impaired, allowing them to read and write by feeling the raised dots on the page. Therefore, facial expressions stand out as less useful for people with sensory impairments compared to the other methods listed.