At a Mathematical Level,if the Two Conditions for Omitted Variable

Multiple Choice

At a mathematical level,if the two conditions for omitted variable bias are satisfied,then

A) E(ui X1i,X2i,... ,Xki) ≠ 0.
B) there is perfect multicollinearity.
C) large outliers are likely: X1i,X2i,... ,Xki and Yi and have infinite fourth moments.
D) (X1i,X2i,... ,Xki,Yi) ,i = 1,... ,n are not i.i.d.draws from their joint distribution.