Your question is Linear Regression Assumptions. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing a linear regression model used to explain portfolio returns from a few market factors. The fit looks decent, but you want to check what has to be true for the coefficients and p-values to be trustworthy.
Walk me through the assumptions behind a linear regression model.