Answer:
A. leaves
Step-by-step explanation:
The primary components for photosynthesis, respiration, and transpiration in plants are leaves.
The process of turning light energy into chemical energy, which is ultimately utilized by the plant for growth and survival, takes place on the leaf during photosynthesis. The chloroplasts in leaves contain the green pigment chlorophyll, which is responsible for absorbing the light energy required for photosynthesis.
The plant also breathes through its leaves, where it absorbs carbon dioxide and exhales oxygen.
Water moves through a plant during transpiration, when it evaporates from aerial components like leaves, stems, and flowers. This procedure aids in the absorption of minerals and nutrients as well as helping to maintain the plant's water balance.
The structures where all three of these processes occur are leaves.