Final answer:
Marianne Carrolton's inability to produce words despite understanding directions and enjoying music suggests she has a language disorder, which affects her ability to communicate verbally and in writing.
Step-by-step explanation:
Marianne Carrolton demonstrates several key characteristics: she enjoys the music, laughs, and can follow directions but is unable to produce words. Based on the information provided, Marianne does not have a hearing impairment because she enjoys music and responds to it emotionally, indicating she can hear it.
Nor does she have an intellectual disability, as following directions for routine tasks like shopping indicates cognitive understanding of these tasks. Since she understands directions and can read but cannot respond verbally or write, Marianne's difficulties are centered around language expression. This suggests that she may have a language disorder.
A language disorder can involve the inability to form words and sentences coherently, and although individuals can understand language, producing it is challenging. This can affect both spoken language, as seen in Marianne's case, and written language, as she is unable to write.