Which of the following statements is a scientific claim?

A. Planet Earth is abundant in water, but there is no way to scientifically determine from where Earth's water originated.

B. The mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency.

C. The early solar system had large amounts of water, so, the oldest objects in the solar system should also be abundant in water.

D. Earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea.