Introduction:
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy. This chemical energy is stored in the form of organic molecules, primarily carbohydrates, which are essential for the growth and development of living organisms. Additionally, photosynthesis also produces oxygen as a byproduct, which is crucial for the survival of many organisms.

Carbohydrates:
One of the main products of photosynthesis is carbohydrates. Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen atoms. Glucose is the most common carbohydrate produced during photosynthesis. It serves as a direct energy source for plants and is also utilized to synthesize other complex carbohydrates like starch and cellulose. Plants store excess glucose in the form of starch, which can be broken down into glucose when needed. Carbohydrates are not only important for plants but also serve as a source of energy for other organisms, including humans.

Fats:
While carbohydrates are the primary products of photosynthesis, plants also synthesize fats during this process. Fats, also known as lipids, are organic compounds that consist of carbon, hydrogen, and oxygen atoms. Fats are a concentrated form of energy storage and are important for insulation, cushioning, and hormone production. Plants store fats in seeds, fruits, and other specialized structures. Additionally, fats are essential components of cell membranes and are involved in various physiological processes.

Proteins:
Proteins are complex organic molecules made up of amino acids. Although proteins are not directly synthesized during photosynthesis, the amino acids required for protein synthesis are produced as a result of this process. These amino acids are then used by plants to synthesize proteins, which are essential for the structure, function, and regulation of cells and tissues. Proteins are involved in various biological processes, including enzyme catalysis, transport, defense, and muscle contraction.

Conclusion:
In conclusion, all of the options, including carbohydrates, fats, and proteins, are synthesized to some extent after photosynthesis. Carbohydrates are the primary products of photosynthesis and serve as a direct energy source for plants and other organisms. Fats are also synthesized during photosynthesis and serve as energy storage molecules, while proteins are indirectly synthesized through the production of amino acids. These organic molecules are crucial for the growth, development, and survival of living organisms.

The right answer is carbohydrate....