What happens next in this paragraph?

How to respect older people
Call people sir or ma'am.
Even if you've grown up in a more casual environment where you usually call your friends' parents by their first names, you shouldn't assume that all older people are comfortable with that kind of informal title. Some elderly people may be more traditional, and prefer that you call them mr./mrs. so-and-so.
Choose your answer from:
(A). If the respect you give isn't apparent in a more informal setting, leave it at that. People like to be called by the lord..
(B). When in doubt, be choosy. It may be tough to get used to calling anyone ma'am or sir if you've never heard of that person before..
(C). Always ask what name they prefer you call them. Use sir or ma'am when you don't feel comfortable asking..
(D). Other people may prefer a more informal title as you become more accustomed to addressing them properly. Remember that you should never call young adults by their first names..
(C).