What is the primary function of parenchyma cells in plants?

Parenchyma cells play a crucial role in various physiological processes within plants, with their primary function linked to photosynthesis and growth. These cells are characterized by their thin cell walls and large central vacuoles, allowing them to effectively store nutrients and contribute to metabolic activities. In green parts of the plant, particularly in leaves, parenchyma cells contain chloroplasts and are responsible for photosynthesis, the process by which plants convert light energy into chemical energy.

Additionally, parenchyma cells assist in growth by serving as the site for storage of energy in the form of carbohydrates and other nutrients. This capability is vital for the plant's energy supply and overall development. While parenchyma cells indeed support plant growth, their distinctive role in photosynthesis makes option C the most accurate representation of their primary function.