Which of the following summaries expresses the main points of the passage best?

A. Gravity is the most important aspect of our universe. Without it, we would all be floating off into the universe. There wouldn't be any orbits; instead, all planetary bodies would simply float around, running into each other when they crossed paths and just wandering forever.

B. There is a gravitational force between all objects in the universe. Gravitational force is what keeps all components of our solar system in orbit around the Sun, as well as moons in orbit around planets. The force of gravity affects Earth's tides and holds us on Earth's surface. The force of gravity between objects depends on their masses and the distance between them.

C. Gravity is hard to understand and scientists have little to no understanding of how it works. We know that gravity is out there, but the specifics are often lost on us. Plants, animals, and humans are all able to grow tall due to the pull on Earth from the Sun. Without the Sun, we would all just stretch out along Earth's surface.

D. None of the above.