Correct option is B
Option (b) is the correct meaning of the idiom
"Have the last laugh".
"Have the last laugh": To ultimately succeed or triumph after being doubted or mocked.
Example: He was mocked for his unconventional ideas, but he had the last laugh when his startup became a success.
Other related idioms:
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"Turn the tables" - to reverse a situation to your advantage.
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"The best revenge is success" - to prove your critics wrong by succeeding.
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"Laugh all the way to the bank" - to earn money or succeed despite doubts or criticism.