Owen (4;5 Years) Pronounces the Same Word in Different Ways

Multiple Choice

Owen (4;5 years) pronounces the same word in different ways and can be difficult to understand. Although he has quite a good phonetic inventory, he does not have consistent error patterns in his speech. His prosody is intact, and his imitated productions of words are better than his spontaneous productions. In light of these observations, Owen most likely has:

A) inconsistent speech disorder.
B) phonological impairment.
C) articulation impairment.
D) expressive language impairment.