Alternatives B and D are the only alternatives that designate the Sheep Mountain area as an ACEC. Due to the larger size and more restrictive management, Alternative B would be the most effective for protecting the vegetation communities, sensitive plants, and big game wildlife habitat in the Sheep Mountain area due to resource use restrictions and travel designations. Management under Alternative B includes the greatest restrictions on ROWs, minerals development, and other surface-disturbing activities in the area, resulting in the greatest adverse impacts to these resource uses compared to the other alternatives. Alternative B would be the most restrictive of travel in the area, and would therefore provide the greatest protection of the values of concern from fragmentation and disruption related to motorized vehicle use.