How does O. Henry draw upon themes, events, or character types from myths or traditional stories and render them new in “The Princess and the Puma?”

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."

"urban sprawl, the spreading of large developments of housing and shopping areas around a city’s center, has many negative cultural and environmental effects. " (from your link)

so, your answer is: it has a negative effect on the environment, otherwise known as c~hope this mate. 

the correct answer is: a) every day, the children play and swim in the lake.

explanation: the topic is about the children playing and swimming everyday in the lake, the rest of the sentence is only a positive description of the outcome of such events.