The answer would be the 4th option. (Rainwater soaking into the ground). Soil erosion is commonly caused by rainwater soaking into the ground.
Answer:
The diameter of the Milky Way is 3,503,974,249,104 km times larger than the diameter of Saturn's rings.
Explanation:
1 light year is the distance light can travel in one year. One light year is equal to exactly to 9,460,730,472,580.8 km.
Therefore the diameter of the milky way in distance is 9,460,730,472,580.8 x
km while the diameter of Saturn rings are about 270,000km.
Comparing both diameters

= 
= 3,503,974,249,104 km
Did some research and found (C). One year
Hope this helps!