The correct answer to you're question is:
B. Studying Mathematics.
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Is it a lion or a tiger ?
Answer:
A: It is a novella that keeps readers guessing about how Manolin truly feels about Santiago.
Explanation:
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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.