The answer is B. Vertical :D
THE ANSWER IS ITS D BUILDINGGGGG
Many Americans of goodwill who want to reduce poverty believe that race is no longer relevant to understanding the problem, or to fashioning solutions for it. This view often reflects compassion as well as pragmatism. But we cannot solve the problem of poverty -- or, indeed, be the country that we aspire to be -- unless we honestly unravel the complex and continuing connection between poverty and race.
Sustainability in an environmental context implies that humans don't have a negative impact on the world. So any way that reduces human impact, such as recycling, is definitely a way to promote sustainability. The alternative to recycling is simply to throw it into the trash or litter, it's obvious which practice is preferable when regarding sustainability.