(a) biodiversity in the area

(b) monoculture in the area

(c) growth of natural forest

(d) preserves the natural ecosystem in the area

Correct option – ( b )

Explanation – monoculture is the practice in which a single crop or plant  farming in the field is done at a time . It increases the planting efficiency , managing and harvesting . But at the same time it increases the risk of diseases .