First, it asked if it was the right decision to differentiate twice, which, according to what I interpret from the Eviews display, would be considered over differentiation.
But then we were asked to identify what was the ARIMA process generating the original series (RENTA, the non-stationary one).
From what I see, the model obtained for the second difference (second picture) D(RENTA,2) would be something like:
But I'm stuck there. I'm not sure if I'm interpreting the output correctly, so I don't know how to get from that expression to the original model. Any help will be very appreciated. Thanks in advance and kind regards.