The correct answer is option c. "photosynthesis and a good root system".
Explanation:
Grasslands are plants that habit the soil and usually cover a large open area of it. The two most important factors of grasslands are photosynthesis and a good root system. The plants need photosynthesis to gather energy from carbon dioxide and sunlight, and the plants need a good root system to find water in the underground and to stay firm on the soil.
