The correct answer is option C, that is, green color.
The plants are green in color as they comprise chloroplasts that exhibit the pigment known as chlorophyll. This chlorophyll captivates red and deep-blue light so that the rest of the spectrum of the sunlight is being reflected, making the plant appear green.
The presence of chlorophyll plays a vital role in the process of photosynthesis. The molecules of chlorophyll are uniquely aligned in and around the complexes of pigment-protein known as photosystems that are embedded in the thylakoid membranes of chloroplasts.
The chlorophyll thriving in the chloroplasts of the plants is essential in order for plants to transform water and carbon dioxide, by utilizing sunlight, into glucose and oxygen.