The correct answer is Neither.
The question pertains to environmental factors that affect ecosystems, which include both biotic (living) and abiotic (non-living) components. Sunlight and temperature are abiotic factors, and they are not specifically tied to either heterotrophs (organisms that consume organic material) or autotrophs (organisms that produce their own food, typically through photosynthesis), as both types of organisms interact with these inorganic factors.