Compare the results in 6 and 7 and choose the statement you agree with: A. Adding extra predictors can improve RMSE substantially, but not when they are highly correlated with another predictor. B....

Compare the results in 6 and 7 and choose the statement you agree with:

A. Adding extra predictors can improve RMSE substantially, but not when they are highly correlated with another predictor.

B. Adding extra predictors improves predictions equally in both exercises.

C. Adding extra predictors results in over fitting.

D. Unless we include all predictors, we have no predicting power.