What term best completes this sentence:
_______________ is a term to describe living and growing plants and animals by use of patterns and features observed in natural ecosystems. It is a philosophy of working with natural forces, such as wind, sun and water, to provide food, shelter, water and other needs with minimum labor and without depleting the land.
a. Crop sharing
b. Xeriscaping
c. Organic gardening
d. Permaculture