You are in charge of product placement at Big Food grocery chain. You are doing model building using regression analysis to determine the relationship between several predictors and product sales. You are very surprised to find that product facings (the number of products that are visible on the shelf) appear to have a negative relationship with sales, as you know this is not in fact the case. What are you likely experiencing in your analysis:

heteroscedasticity

multicollinearity

extrapolation

autocorrelation