I x2 is a binary predictor ie it is a dummy variable in y

Question

If X₂ is a binary predictor (i.e. it is a dummy variable) in Y = β₀ + β₁X₁ + β₂X₂, then which statement is most nearly correct?

A. X2 would be a significant predictor if β2 = 423.72

B. X2 will shift the estimated value of Y either by 0 units or by β2 units

C. X2 = 0, X2 = 1, X2 = 2 would be appropriate if three categories exist

D. X2 = 1 should represent the most desirable condition