Final answer:
A long-handled comb is an adaptive device primarily used for grooming, specifically designed to help individuals with limited mobility to comb their hair.
Step-by-step explanation:
A long-handled comb is an adaptive device designed to assist individuals with limited mobility or range of motion. The question asks what activity this device is made for. Such a comb is primarily used for grooming purposes, particularly for combing hair by individuals who might have difficulty reaching their head due to physical constraints.
Regarding the options provided in the question: A) Grooming is correct because it directly relates to combing hair. On the other hand, B) Eating, C) Writing, and D) Walking are activities that would generally require different types of adaptive devices. Therefore, the correct answer to this question is A) Grooming.