Which of these lines from “The story of an hour reveals the reason for mrs. mallard’s new found excitement?
A. She was drinking in a very elixir of life through that open window.
B. There would be no one to live for during those coming years; she would live for herself.
C. She carried herself unwittingly like a goddess of Victory.
D. The notes of a distant song which some one was singing reached her faintly.

The lines from "The Story of an Hour" that reveal the reason for Mrs. Mallard's new found excitement are found in the second option - There would be no one to live for during those coming years; she would live for herself.

Mrs. Mallard was living in an unhappy marriage until her husband died - after that, even though she was sad for his death, she was also happy because she finally got her freedom. 

Explanation:

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the theme of universality in town is expressed in ensuring all citizens upon the occurrence of a relevant social circumstance (sickness, unemployment, old age, employment injury, having many children, maternity, disability, loss of the breadwinner, etc.)