According to current scientific theory, how did the planets of the solar system form? A. Solid grains of various sizes collided and stuck together, building up to make the planets.
B. Chunks of the early sun split of and began to revolve around what was left.
C. A supernova of another sun threw large, planet-sized chunks toward our solar systems sun.
D. The strongest gravitational pull of our sun drew the planets away from other solar systems.

what was the answer?

it would be c. predictability

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.