In the regression analysis formula, what does the X represent?

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Indicate whether the statement is true or false

You are looking at a stock quotation in the newspaper and read that its "net change" is +2.5. This means that

A) the difference between its high price and low price for the day was $2.50. B) its closing price was $2.50 higher than its closing price of the previous trading day. C) over the past 12 months the stock's highest price is 2.5 times its lowest price. D) its dividend yield this year is 2.5% higher than its dividend yield last year.