A fundamental distinction of entire trend forecasting in the trend line and linear regression model is that?

A) in trendline forecasting the independent variable is time, in linear regression the independent variable need not be time, but can be any variable with explanatory power. B) the trend projection uses least squares, while the linear regression does not use least squares. C) only linear regression can have a negative slope. D) trend projection can be a function of several variables, while linear regression can only be a function of one variable.