Answer:
The correct answer is option A: "The desert was once a vast ocean".
Step-by-step explanation:
One of the most prominent fish fossils that were found in the arid deserts of western Egypt belong to the Giant Catfish named Qarmoutus hitanensis, that lived roughly 37 million years ago as it was scientifically determined. The presence of this and other related fossils indicate that the desert was once a vast ocean. Actually, the arid landscape of this zone has been named Wadi Al-Hitan (which means Valley of the Whales) in honor to its past.