The correct answer is D. it tells of the origins of something.
Here we can see how the horse came to be - it was made out of clay and shaped into a horse, and this is why today we have horses, at least according to this myth. Myths have often been created to explain the origin of many things that were usually inexplicable at the time.
Reasonable guess (4th option)
The answer is B because it can be easily shortened down/ make more sense without the commas to: I heard in the weather report that it's going to rain.
In "Babylon Revisited", Marion needs to believe in a Just God who always does what is right.
I'm pretty sure that the answer is C