Which of the following types of light are strongly absorbed by plants?

The correct answer is B because photosynthesis primarily depends on the absorption of light by chlorophyll pigments, specifically chlorophyll a and chlorophyll b. These pigments are most efficient at absorbing light in the blue and red regions of the visible spectrum. Blue light is crucial for vegetative growth and leaf development, while red light is essential for flowering and fruit production. In contrast, plants reflect green light, which is why they appear green to the human eye, and they absorb very little yellow or indigo light. Therefore, blue and red are the two wavelengths most strongly absorbed and utilized for energy conversion.