Which condition is associated with the inability to use objects properly?

Apraxia is the condition associated with the inability to use objects properly. It typically occurs when there is a disruption in the brain's ability to plan and execute the coordinated movements necessary to perform tasks, even though the individual has the physical ability and the desire to carry out the action. For instance, someone with apraxia may understand how to use a tool but may struggle to actually perform the required movements to use it correctly, such as brushing their teeth or using a fork.

In contrast, aphasia refers to a language disorder affecting an individual's ability to communicate, both in speaking and writing, and is not specifically about object use. Ataxia is characterized by a lack of muscle coordination, affecting overall movement and balance, rather than the specific action of object manipulation. Agraphia describes an inability to write, which is related to the process of forming written language, rather than the use of objects. Thus, the defining feature of apraxia directly relates to the improper use of objects, making it the correct answer in this context.