Correct Answer: ABCD

Solution : The correct order is the first option: ABCD.

The logical flow of sentences is:

• Sentence A: Sets the stage by describing the sudden discovery of a superb diamond necklace in a black satin box.
• Sentence B: Describes the physical reaction of the protagonist, with her hands trembling as she takes the necklace.
• Sentence C: Expands on the protagonist's emotions as she fastens the necklace around her throat and gets lost in ecstasy while looking at her reflection in the mirror.
• Sentence D: concludes the sequence by revealing the protagonist's hesitating request to her friend, filled with anxious doubt, asking if she can borrow the necklace.

Therefore, the correct sentence would be: Suddenly she discovered, in a black satin box, a superb diamond necklace, and her heart throbbed with an immoderate desire. Her hands trembled as she took it. She fastened it around her throat, outside her high-necked waist, and was lost in ecstasy at her reflection in the mirror. Then she asked her friend, hesitating, filled with anxious doubt: 'Will you lend me this?'