With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The mission of the BLM is "to sustain the health, diversity, and productivity of the public lands for the use and enjoyment of present and future generations." Originally BLM holdings were described as "land nobody wanted" because homesteaders had passed them by. All the same, ranchers hold nearly 18,000 permits and leases for livestock grazing on of BLM public lands. The agency manages 221 wilderness areas, 27 national monuments and some 636 other protected areas as part of the National Conservation Lands (formerly known as the National Landscape Conservation System), totaling about. In addition the National Conservation Lands include nearly 2,400 miles of Wild and Scenic Rivers, and nearly 6,000 miles of National Scenic and Historic Trails. There are more than 63,000 oil and gas wells on BLM public lands. Total energy leases generated approximately $5.4 billion in 2013, an amount divided among the Treasury, the states, and Native American groups.
text_B: Is it likely that past homesteaders were driven away from BLM lands due to harsh conditions?
YES.