Correct Option: C

The first product of photosynthesis is a threecarbon compound called phosphoglyceric acid and phosphoglyceraldehyde. Almost immediately, two of these join to form a glucose molecule. Certain herbaceous plants such as sugarcane, corn, and sorghum, form as the first products of photosynthesis not threecarbon but four-carbon compounds— oxalacetic, malic, and aspartic acids.