If you look at page 453, it is pretty clear it was GDP
I put “potential GDP” drops this page 453 said increased labor increases Real GDP and increases potential GDP as it moves up the curve from point A to B. Real and potential GDP will decrease if they are asking for “per hour of labor” but I don’t remember them asking for “per hour of labor”… so if the question was “Real” GDP and Potential GDP would both be right. GDP by itself (unspecified as real or nominal) may not be the best answer. I’ll stand by “Potential GDP”
Potential GDP was not a choice, it was GDP, but the word potential may have been part of the question, I don’t remember
Potential GDP was definitely a choice. It was B if I remember correctly.