Final answer:
Poverty of speech refers to a reduction in the amount or quality of speech output. It is characterized by limited verbal communication, the use of minimal words, or speaking in monosyllables.
Step-by-step explanation:
Poverty of speech refers to a reduction in the amount or quality of speech output. It is characterized by limited verbal communication, the use of minimal words, or speaking in monosyllables. Option d is correct, as all the given statements are true about poverty of speech. Someone with the poverty of speech may speak very little (option b), which is reflective of a lack of thoughts to express (option a), and may speak in monosyllables (option c).