Respuesta :
Answer: The sentence that creates an element of surprise is the last one: "You say you bought a diamond necklace to replace mine?'' (Paragraph 10).
Explanation: In paragraph 10, the element that has been used to convey surprise is a rhetorical question, which is a question that someone asks without actually expecting to receive an answer. Moreover, the expression "you say" also contributes to create an element of surprise. In that way, the correct answer is "You say you bought a diamond necklace to replace mine?'' (Paragraph 10).