Problem breakdown please

Please help. Answer choice is not making sense.

Hi all, What is key here is to recognize that the fact that not all farmers should go organic does not entail that we must halt the spread of organic farming. Thus, if (B) is true, then we can see that there is a possibility that we haven't reached the point where there's too much organic farming, since some farmers will choose not to adopt. Feel free to ask any further questions, hope that helps.