Health Valley is a brand of food, such as breakfast cereals, that uses all natural and organic ingredients. Moreover, they only purchase grain from organic farms. They state on their packages that "organic farming helps keep our food pure and protects our land and water from harmful substances. By supporting dozens of small organic farms, Health Valley helps protect a way of life for these family farmers, and helps ensure a safer and healthier Earth for you and your children." This is an example of $\_\_\_\_\_.$

Group of answer choices

clean marketing

green marketing

environmental marketing

cause$-$related marketing