cbplayer

It is desirable to expand the yield of a harvest only when________________additions in time,exertion, and other variable factors of production are not also required .choices :predestined commensurate analogousdeliberate indeterminateI read an explanation from the Princeton Review book but I still don't get why commensurate is the answer. I understand that idea behind this sentence is that expanding the yield of harvest is desirable if it doesn't require extra work but I can't see why one would pick commensurate or a similar word as the correct word. I mean, through process of elimination, I might be able to end up with commensurate as the answer but I would never have thought that it would be the right word. When I was trying to come up with a word, I thought "several" would be a good word. Am I missing something?