Fossilized remains of a dinosaur were found in a desert oasis in Egypt. The site was long ago a lush coastal paradise. The remains were of a gigantic plant-eating dinosaur. It was the second most massive animal ever to walk the earth.
The dinosaur has been named Paralititan stromeri. The discovery was made by Joshua Smith. Smith is a 31-year old doctoral student at the University of Pennsylvania. He went on a dinosaur hunt at a remote site. The site had had spectacular finds in the first half of the 20th century. Those expeditions were led by German paleontologist Ernest Stromer von Reichenbach.

What is the central idea of this passage?
A.
The discovery site was once a lush coastal paradise.
B.
A discovery of dinosaur fossils was made in Egypt.
C.
Joshua Smith made a very important discovery.
D.
Egypt has had many archeological discoveries.