Option A is incorrect too, as the passage talks about distinguishing between urban/rural, not about accurately identifying rural areas.
Option B is correct as it correctly captures the essence of the passage.
Option C is incorrect, as it mentions "is no longer relevant" whereas the author says may no longer be relevant.
Option D is distorted. Judgement would be required on the richer criteria , not on the objective methodology, as mentioned in this option.
So, the correct option is (B): With the diversity of urban landscapes, measurable criteria for defining urban areas may need to be supplemented with human judgement.