The right answer for the question that is being asked and shown above is that: "D. Britain's isolation from the rest of the world." The optimism that characterized Londoners during the Victorian age was primarily caused byD. Britain's isolation from the rest of the world.
Celebrity endorsement is the persuasive technique that involves the promotion of a service or product by a famous athlete or movie star in exchange for large sums of money.
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Can you post the passage, so I could help?