Question

where do plants get the carbon they need to make glucose during photosynthesis?
options: animals, ground, sun, air (with an image of plants on the left)

Explanation:

During photosynthesis, plants use carbon dioxide ($CO_2$) to produce glucose. Carbon dioxide is present in the air. Animals are not a source of carbon for plant glucose production in this context. The ground doesn't provide the carbon for glucose (it provides water and minerals), and the sun provides energy, not carbon. So the correct source is air.

Answer:

air (the option in the red - colored box labeled "air")