If There Are Multiple Significant Outliers in Multiple Regression Analysis

If there are multiple significant outliers in multiple regression analysis, what does this indicate to a researcher?

A) The research topic is strongly flawed and the research should be recompleted.
B) Many of the study subjects likely lied during the research process.
C) It will be very difficult to accurately predict the value of the dependent variable.
D) The researcher made a mistake collecting data.