Answer:
The exclamation mark should be used in the end of sentence.
Explanation:
The correct answer is:
What would happen if love didn’t die?
An independent clause is a clause that can stand alone as a sentence. When you read the sentence "what would happen if love didn’t die? you could use it as a sentence by itself, doesn't need any complement to make sense. On the other hand, the sentence "If the poem is about going mad when love is lost," is the dependent clause, because it needs a complementary sentence to complete the idea.
The third excerpt is structured correctly.
