HR department of your company wants you to make a model to better understand the overall satisfaction of employees of your company. An anonymous survey was conducted by the HR department where some employees were asked to rate their satisfaction on a scale of 1-10. The data was matched to other variables like salary, position in company hierarchy, last promotion, age-group, sex and marital status. You are tempted to straight-forward apply a linear regression model with satisfaction level as response but you realize that you are violating a basic assumption for linear regression. Which one is it? (Pick the most obvious)

A. Error terms are correlated

B. The assumption of a linear structure of relationship between the response and the predictors is incorrect.

C. There is a non-constant variance of error terms

D. Errors are not normally distributed.