How can the action spectrum be used to assess photosynthetic activity across different wavelengths?

• A. By plotting photosynthetic activity against wavelength, allowing identification of the most effective wavelengths for photosynthesis.
• B. By plotting absorbance against wavelength, allowing identification of the most effective wavelengths for photosynthesis.
• C. By plotting photosynthetic activity against time, allowing identification of the most effective wavelengths for photosynthesis.
• D. By plotting absorbance against time, allowing identification of the most effective wavelengths for photosynthesis.

Answer: (A)