Answer:
What causes the Catatumbo Lightning.
Explanation:
The main idea of the text is what causes the Catatumbo Lightning since, after the first sentence, there are several theories that scientists proposed for the cause of this phenomenon and more information about events related to the Catatumbo Lightning that also increased the mystery around the climate phenomenon.
The answer will be an adverb thats how i got my answer
Its called a double replacement/displacement reaction.
A, because it says the year
