The correct answer is b) chloroplast.
Chloroplasts are specialized organelles found in the cells of plants and some algae. They contain chlorophyll, the green pigment that captures light energy from the sun, which is essential for photosynthesis. During this process, chloroplasts convert carbon dioxide and water into glucose and oxygen, using sunlight as the energy source. This is a crucial function for the plant, as it allows them to produce their own food and release oxygen into the atmosphere. Other options listed, such as calcisomes, lysosomes, mitochondria, and smooth endoplasmic reticulum, serve different roles in the cell and do not perform photosynthesis.