•It is raining• is a Clause :)
Answer:
It explains why something occurs
Explanation:
Cause and effect is a structure that is used to tell readers about the cause of something WHY SOMETHING HAPPENS and the effect WHAT HAPPENS WHEN THE EVENT OCCURS
This would be the excerpt from "Marigolds" that best illustrates an explicit example of setting:
<span>I remember only the dry September of the dirt roads and grassless yards of the shantytown where I lived.
The writer describes the setting explicitly.</span>