Purple Photosynthetic Bacteria Do Not Contain Chloroplasts

Purple photosynthetic bacteria do not contain chloroplasts.They have an antenna system that includes two light-harvesting protein complexes,both of which are integral membrane proteins.The bacteriochlorophyll a molecules contain Mg²⁺ and absorb light at 800 nm.Which of the following statements comparing photosynthesis in purple bacteria and plant chloroplasts is true?

A) Because purple bacteria do not have chloroplasts,there is no electron transport associated with photosynthesis.
B) Bacteriochlorophyll a is a molecule containing Mg²⁺,whereas chlorophyll a from chloroplasts contains Fe²⁺.
C) Bacteriochlorophyll a absorbs light most efficiently in the ultraviolet range,at a significantly shorter wavelength than that for chlorophyll a of chloroplasts.
D) Plant chlorophyll a absorbs in the visible light range,whereas purple photosynthetic bacteriochlorophyll a absorbs light at a longer wavelength.