Final answer:
The correct answer is a) 3-5. Children aged 3-5 years usually exhibit the greatest number of management problems in a dental office, as they are still in their early childhood and learning to become more independent and physically active.
Step-by-step explanation:
Children aged 3-5 years usually exhibit the greatest number of management problems in a dental office. During this stage, children are still in their early childhood and are learning how to become more independent and physically active. They may have difficulty sitting still or following instructions, which can make it challenging to manage their behavior in a dental office.
Additionally, at around age 6, most children begin losing their deciduous (baby) teeth, and their permanent teeth start coming in. This can cause additional management problems as young children may experience teething discomfort or be resistant to dental procedures.