In the study of language impairments, those with ASD are subgrouped into high-functioning language-normal (HF-LN), high-functioning language impaired (HF-LI), lower-functioning language impaired (LF-LI) and lower-functioning nonverbal (LF-NV) because..............
a. subgrouping in this way highlights the fact that language abilities form a continuum across the spectrum.
b. it makes it easier to consider the set of causes that may be contributing to variations in language profiles.
c. this is the way language impairment has always been studied