Citigroup is a big bank that does business all around the world. Some people who own the bank's stock are betting that the stock price will go up or down in the future. They are doing this by buying or selling options, which are a special type of contract that gives them the right to buy or sell the stock at a certain price by a certain date. Recently, some of these option trades have been very big and important, and people are trying to figure out what they mean for the bank's stock price. Read from source...

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