Which cross-section from the possibilities below matches what would be needed to make the fringe pattern seen?

the servant does not kill the child oedipus as he was ordered to do because "he pitied the child" based on the oedipus rex story. the servant was ordered to kill the child because of the prophecy that predicted king laius' death. the king already had attempted to hurt oedipus by piercing oedipus's ankle. however, the servant did not finish the job and he rather saved the baby oedipus.

explanation:

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.