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In the K-line chart of the futures market, when () is higher than the opening price, a positive line is formed.
Answer: d

Each K-line in the K-line chart represents the opening price, closing price, highest price and lowest price of a trading period. The entity represents the difference between the opening price and the closing price. When the closing price is higher than the opening price, a positive line is formed. When the closing price is lower than the opening price, a negative line is formed.