Write the best-fit linear model for the data.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). Find a linear function that approximates the number of products sold as a function of the cost of advertising. 
A. y = 55.8 - 2.79x
B. y = -26.4 - 1.42x
C. y = 26.4 + 1.42x
D. y = 55.8 + 2.79x
Answer: D
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