The Following Regression Analysis Was Conducted for the Inflation Rate

The following regression analysis was conducted for the inflation rate information and exchange rate of the US dollar: ​
E_BP = a₀ + a₁ * [(1 + I _US) /(1 + I_B) -1] + μ
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Regression results indicate that a₀ = 0 and a₁ = 2. Therefore:

A) purchasing power parity holds.
B) purchasing power parity overestimated the exchange rate change during the period under examination.
C) purchasing power parity underestimated the exchange rate change during the period under examination.
D) purchasing power parity will overestimate the exchange rate change of the British pound in the future.