Answer:
The answer is A. Strength machines provide extra support for special-needs clients.
Step-by-step explanation:
When all types of clients are considered (with regard to using strength machines)—especially as they (machines) could be complicated to use—an advantage of using strength machines is that it provides support for special-needs clients, and other categories of clients, even novices. At the end of the day, the effectiveness of strength machines will depend much on how helpful they have been to clients, especially those with special aims or needs that might not be general or popular.