What is the problem and solution in the book 39 clues book four if u read it

Beyond the Grave is the fourth book in The 39 Clues series first published in June 2, 2009 and written by Jude Watson.[1]Thematically the novel uses Biblical knowledge, prophecy, and spiritual topics to explore the afterlife. Amy and Dan Cahill, the protagonists, travel to Egypt because of a clue they discovered in The Sword Thief.[2] The symbols in the middle of the book translate "Alistair was there the night they died."

Beyond the Grave was awarded one of Good Morning America's pick for teen summer reading.[3]

answer: i chose a.

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).