In Which of the Following Will Omitted Variable Bias Be $\beta$

In which of the following will omitted variable bias be the most severe? Treat X2 as the omitted variable in a bivariate model of
Y_i = $\beta$ ₀ + $\beta$ ₁X_1i + $\varepsilon$ _i

A) X2 is weakly related to X1, but strongly related to Y.
B) X2 is unrelated to X1, but strongly related to Y.
C) X2 is strongly related to X1, but not related to Y.
D) X2 is strongly related to X1 and strongly related to Y.

Correct Answer:

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