Subject: Why do plants use chlorophyll?

My friends and I are having a debate:

The maximum flux for a blackbody of the temperature of the sun (5785 K)
is in the yellow-green portion of the optical spectrum. But plants
reflect green light, using instead the red and blue light that arrives on
earth. I say that plants use chlorophyll because the earliest autotrophs
lived in the sea, which transmits more blue light than green. My friends
say that it's because chlorophyll is a simple molecule to construct
and furthermore that it evolved from an earlier structure that was less
efficient than chlorophyll. Can you help us out? Thanks

Re: Why do plants use chlorophyll?