Passive articulators, like the roof of the mouth, provide a fixed surface against which active articulators produce speech sounds.
In phonetics, the roof of the mouth is classified as a passive articulator. Passive articulators do not move; instead, they form the surface against which the active articulators (such as the tongue) make contact to produce speech sounds.
Given the following phonological rule, which one of the options CANNOT be an output?