What is the "twist" that George Bernard Shaw puts on the original story?

(George Bernard) Shaw's original treatment is more complex, a little darker. There's a strong social message that's sort of put aside in the musical.

Explanation:

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

what are the choices?