Final answer:
The sequence of astronomical bodies from smallest to largest is the solar system, the Milky Way galaxy, and the universe, corresponding to option B.
Step-by-step explanation:
The question asks for the correct sequence of astronomical bodies in terms of their size from smallest to largest. The correct sequence is the solar system, the Milky Way galaxy, and then the universe. This order is based on the fact that our solar system is a collection of planets and other celestial objects orbiting our star, the Sun, which is just one of the billions of stars contained within the Milky Way galaxy. The Milky Way galaxy is itself one of the countless galaxies within the universe.
The correct choice from the provided options is B: the solar system, the Milky Way galaxy, our universe.