The process by which simple chemical elements developed into more complex elements, molecules, and compounds, and led to the eventual synthesis of large organic molecules, is known as
a.
cellular respiration
b.
photosynthesis
c.
organic evolution
d.
chemical evolution

The answer to your question is letter B. Photosynthesis

Explanation:

Photosynthesis is a chemical process by which plants and other microorganisms use energy from the sun to produce glucose, water and carbon dioxide. After that, glucose is converted into Pyruvate which goes into Glycolysis and the Krebs cycle.

This description mentions that from simple molecules organisms can to form more complex structures.