What effect does the use of a literary device have on the meaning of this passage?

Some people like to believe that they can make it in the world alone, but in reality, we all depend on each others goodwill. An act of kindness is an invitation to live

A. It sums up the message in a short memorable statement
B. It explains the main point by referencing a familiar figure
C. It illustrates the nature of a problem that is too often ignored
D. It extends a heartfelt invitation to the reader