What degree of hearing loss is classified as profound?

Profound hearing loss is defined as a significant degree of hearing impairment that affects an individual's ability to detect sounds. This classification typically indicates a hearing threshold of 91 decibels (dB) or greater. At this level, individuals may perceive sounds only if they are significantly amplified, and they often rely on visual cues and other means of communication due to their severe difficulties in hearing. Thus, the classification of hearing loss as profound is accurately represented by the threshold of 91 dB or higher, making this the correct answer.

The other ranges of hearing loss presented do not reach the severity required for profound classification. For instance, 71-90 dB is considered severe hearing loss, while 56-70 dB falls within moderate to severe hearing loss, and 41-55 dB is classified as moderate hearing loss. Each of these categories indicates varying levels of hearing impairment, but only the threshold of 91 dB or more is recognized as profound hearing loss.