Which of the following best describes a disorder of written language?

The best description of a disorder of written language is fluent word recognition impairment. When individuals have difficulty recognizing and processing written words fluently, it directly affects their ability to read and write effectively. This impairment can manifest in various ways, such as struggling with spelling, decoding words, and understanding written text, which are all essential components of written language skills.

Fluent word recognition is crucial for comprehension and expression in written form. When an individual has an impairment in this area, it can significantly hinder their ability to generate meaningful written language and engage with text, distinguishing it clearly as a disorder related to written language.

In contrast, the other choices relate to different aspects of communication. A severe aversion to writing may be more of a behavioral response than a cognitive disorder of written language. The inability to speak clearly pertains to verbal communication issues rather than written language, and lack of understanding in spoken language refers to auditory processing or comprehension difficulties, which also do not directly describe a written language disorder. Each of these conditions are related but does not specifically address impairments in the ability to process or use written language.