Leila Corporation Used the Following Regression Model to Determine If

Leila Corporation used the following regression model to determine if the forecasts over the last ten years were biased:
S_t = a₀ + a₁Ft -1+ m_t,
Where S_t is the spot rate of the yen in year t and Ft _-1 is the forward rate of the yen in year t - 1. Regression results reveal coefficients of a₀ = 0 and a₁ = .30. Thus, Leila Corporation has reason to believe that its past forecasts have ____ the realized spot rate.

A) overestimated
B) underestimated
C) correctly estimated
D) none of the above