Final answer:
Around 55% to 60% of individuals with panic disorder seek treatment. The closest approximate figure from the given options is 50%.
Step-by-step explanation:
The proportion of people with panic disorder who seek treatment can be quite variable, but according to some estimates, approximately 55% to 60% of individuals with panic disorder seek treatment. However, as the options provided in the question do not include this range, the closest approximate figure from the given choices would be c) 50%. It is important to note that there might be variations based on demographics, access to healthcare, and awareness levels.