Consider the model: yt= 
0+ 1zt1+ 2zt2 + ut. Under weak dependence,
the condition sufficient for consistency of OLS is:
A. E(zt1|zt2) = 0.
B. E(yt |zt1, zt2) = 0.
C. E(ut |zt1, zt2) = 0.
D. E(ut |zt1, zt2) = 
.
Answer: C
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