Christine is interested in buying a new backpack. She compares the price and volume of several backpacks. Christine finds that the relationship between price and volume can be described by the following least square regression line:Predicted Price = 890 - 105(Backpack Volume).What is the slope of Christine’s data?a) -105 price/volumeb) -105 volume/pricec) 105 price/volumed) 105 volume/price