You need to put the text up or no one can help you.
Theme is the central idea or meaning of a story. Theme in fiction is rarely presented at all; it is abstracted from the details of character and action that compose the story. It provides a unifying point around which the plot, characters, setting, point of view, symbols, and other elements of a story are organized.
Answer: B
Explanation:
A - 18 is not spelled out; should be 'eighteenth'
B - correct
C - no apostrophe in the decade; should be '50's'
D - name of the decade is spelled out; should be '1970s'