Green plants get the energy they need to make food from
A. air
B. sunlight
C. water
D. soil
Plants make their food via a process called photosynthesis, which requires sunlight, chlorophyll, water, and carbon dioxide gas[1]. Plants get water from the soil and carbon dioxide from the air[1].

B
Plants get the energy they need to make food via photosynthesis, which uses sunlight as its source of energy [1, 2, 3, 4]. Chlorophyll is the substance that gives leaves their green color and plays a key role in capturing sunlight to make glucose [1, 4]. The glucose can be used directly by the plant or may be converted into other compounds, like sugar, that can be used by the plant [1, 4]. Soil and water do not actually provide energy to the plant, though they are necessary for plant growth [2, 3]. 

B