The correct option is A The pasture became overgrazed and barren
Carrying capacity is the maximum size of the population of a species that a certain environment can support for an extended period of time. Overgrazing of pasture would make it barren. Once population overshoots the carrying capacity, it starts decreasing as at this point. An overgrazed pasture would no longer support the cattle leading them to starve or look for another food source. Thus, the correct answer is B.