It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently.” Here, Buffett says that anyone's reputation can quickly take a hit and to always act with integrity. Otherwise, a whole career can be ruined easily no matter the effort over the years.
A subject is the word, usually in a form of nouns, that is being talked about in the sentence. A subject can either be simple or compound. In the given sentence above, the subject is the word "we". And "we" is the direct doer of the action word "invite".
The answer is C! A narrative is kind of like a short story.