Answer:
B. Unheated buildings would result in a destructive freeze-thaw cycle.
Explanation:
The clearest example of cause and effect in "The City Without Us" is "unheated buildings would result in a destructive freeze-thaw cycle".
Cause and effect, as the name implies refers to the outcome of something due to an action carried out.
The above answer is actually a cause and effect because it shows that "unheated buildings" (cause) will lead to "destructive freeze-thaw cycle" (effect). That means, due to unheated buildings, destructive freeze-thaw cycle will occur.
"The City Without Us" is a chapter from "The World Without Us" which was written by Alan Weisman. The non-fiction book talks about the result of the natural environment when there are no humans living in there.
A preposition is a word that comes before a noun or pronoun (most of the time) that describes the nouns relationship with another word in the same sentence.
Examples of pronouns:
He pushed the pencil in the pencil sharpener.
The boy jumped on the trampoline.
