NADP
Photosystem 1 is a photochemical reaction
complex that uses energy from the light to produce high energy carriers NADPH
and ATP. Chlorophyll complex p700 have being identified as the photo-oxidation
reaction Centre in photosystem 1. However, NADP is known to be the final
electron acceptor in photosystem 1.
The answer is "a" if the second word is "bends" not "burns".
Tar sands pits , sorry if I got this wrong