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Based on the options given, the possible answer for this query is "a. “Oh, sir, she smiled . . . / . . . but who passed without / Much the same smile?”. . . Thank you for your question. Please don't hesitate to ask in Brainly your queries.
The answer is:
a. “Oh, sir, she smiled . . . / . . . but who passed without / Much the same smile?”. . .
In the lines from Robert Browning's poem "My Last Duchess," the Duke exhibits feelings of jealousy for The Duchess' behavior. Therefore, he acknowledges she was charming and smiled to him , but not in a special manner. The reason is she put on a happy expression to everybody in the room.