Answer:
The first is the snowstorm, which brings large amounts of falling snow, and the second is the blizzard, a violent storm that features extreme cold, strong winds, and low visibility.
Explanation:
A compound-complex sentence is a sentence that consists of at least two independent clauses and at least one dependent clause.
Independent clauses are clauses that can stand alone as a sentence. Every sentence must contain a subject and predicate and express a complete thought. Independent clauses contain all of these elements, while dependent clauses don't, which is why they can't stand alone.
The last sentence is the only example of a compound-complex sentence. It consists of the following clauses:
- <em>The first is the snowstorm... -</em> independent clause
- <em>... which brings large amounts of falling snow... </em>- dependent clause
- <em>... the second is the blizzard, a violent storm that features extreme cold, strong winds, and low visibility. </em>- independent clause
As we can see, this sentence consists of two independent clauses and one dependent clause, which makes it a compound-complex sentence.
This is why the fourth option is the correct one.