Solve clearly.

Explanation is more important.. don't copy

1) Which of the following is true about weak instruments?

A,A weak instrument fails the exogeneity condition.

B,The larger the sample size, the bigger the problem (bias) caused by the use of a weak instrument.

C,A weak instrument is an instrument that does a poor job of explaining right-hand side endogenous variable, X.

D,A weak instrument is correlated with the error term.