I think there were a bunch of astronomical ones earlier in this thread... but I like this one... Which of these moons is the correct distance from the earth (properly to scale)?The ratio between a mile and a light year is within 0.2% of the ratio between an inch and an "astronomical unit", or the average distance between the earth and the sun. Big deal, huh? Buuuut ... if you want an easy way to visualize how empty space is in terms of distances we call understand, it means that if we imagine the solar system to be shrunk so that the earth is an inch from the sun, each light year is a mile. That means that the closest star system (Proxima Centauri) is 4.2 miles away, and the brightest star, Sirius (off Orion's right foot) is 8.7 miles away.
C is correct