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In the lower regions of Uttaranchal, a toxic weed called leafy spurge was accidentally introduced and has grown and spread rapidly, covering millions of acres of grass- lands. Leafy spurge is generally avoided by cattle and horses and may be toxic to them. Thus, grasslands where leafy spurge has spread has been damaged by the invasion of this plant. Plants such as leafy spurge can double their population size every year in part because of their efficient production of large amounts of seeds. Populations that can double every year, such as leafy spurge.

A)  can do so endlessly, eventually covering all of the land on Earth.

B)  exhibit constant growth increasing by the same amount every year.

C)  exhibit a state of equilibrium when they are spreading.

D)  exhibit exponential growth as they spread to new regions.