The conversion of solar energy into chemical energy is carried out directly in:

Explanation

Option B is correct. Chlorophyll a is the primary pigment responsible for the direct conversion of solar energy into chemical energy during photosynthesis. This process occurs in the light-dependent reactions where chlorophyll a absorbs sunlight, leading to the production of ATP and NADPH. These molecules are then used in the light-independent reactions to synthesize glucose. Chlorophyll c and carotenoids serve as accessory pigments, transferring energy to chlorophyll a, but do not directly convert solar energy. Bacteriochlorophyll is specific to bacteria and does not play a direct role in the photosynthesis of plants, algae, or cyanobacteria.