Answer:
c. an elderly, frail-looking person
Step-by-step explanation:
This is because, human mind has been programmed to seek out the kind of help it renders based on the age of the individual in question irrespective of the country or culture one finds himself or herslf in.
Example, in a bus, someone is going to give up his seat for an elderly, frail looking person than a young adult or middle-aged adult.