I choose the third one. It’s the only one that makes sense to me.
Answer:
D. Martin Luther King's famous speech used two memorable refrains: "I have a dream" and "Let freedom ring".
Explanation:
A colon instead of a semicolon may be used between independent clauses when the second sentence explains, illustrates, paraphrases, or expands on the first sentence.
The hard and fast rule is that a colon must ALWAYS follow a complete sentence.
The first sentence is correct.
