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What effect does the use of 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 extends a heartfelt invitation to the reader
b. it illustrates the nature of a problem that is too often ignored.
c. it explains the main point by referencing a familiar figure.
d. it sums up the message in a short memorable statement.