Answer:
3. The superhero is afraid of heights.
"The superhero is afraid of heights." is independent clause because the sentence contains a subject and verb and it's a complete sentence.
Explanation:
An independent clause is a group of words that contains a subject and verb and expresses a complete thought. An independent clause is a sentence.
Jim studied in the Sweet Shop for his chemistry quiz.
A dependent clause is a group of words that contains a subject and verb but does not express a complete thought. A dependent clause cannot be a sentence. Often a dependent clause is marked by a dependent marker word. A dependent marker word is a word added to the beginning of an independent clause that makes it into a dependent clause. Some common dependent markers are: after, although, as, as if, because, before, even if, even though, if, in order to, since, though, unless, until, whatever, when, whenever, whether, and while.
When Jim studied in the Sweet Shop for his chemistry quiz . . .
(What happened when he studied? The thought is incomplete.)
Hope this helps!!!