【单选题】Which of followings is TRUE according to the passage?
A.
Toxins released into the soil through the plants´ routes mean fewer soil bacteria, which are integral to healthy soil for plants to grow without the use of chemical fertilizers.
B.
The irrigation used to grow GM foods naturally carries all of these problems into water sources and into the air.
C.
Nutrients are returned to the soil in mono crops and from GMO foods, meaning that soil contains all nutrients, generally integral to the growing process.
D.
The nature of GMOs means fewer weed, flowers and, therefore, less nectar for pollinators.