Question

a gas that plants take in through small holes in their leaves for the process of photosynthesis. options: sand, carbon dioxide, glucose, products (with an image of green plant leaves/cells)

Explanation:

Photosynthesis in plants requires carbon dioxide ($\ce{CO_2}$) which they take in through stomata (small holes) in leaves. Sand is a solid, glucose is a product of photosynthesis, and "products" is a general term. So the correct option is carbon dioxide.

Answer:

B. carbon dioxide (assuming the options are labeled as A. sand, B. carbon dioxide, C. glucose, D. products)