Please help me fast

The last option

Explanation:

They are not the same thing, so it's NOT A.

A story can have different themes and central ideas and it's never the same amount, so it's NOT B.

An author rarely tells a theme, and more than likely tells the you central idea directly or indirectly, so it's NOT C.

Based off all the others it has to be D.

a  as there are 3 DETAILS,  you most of the time have t guess both, and the moral is the message, not theme. Theme is just an idea the text centers around.

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.