Use the following information to answer the question.
Paulinella chromatophora is one of the few cercozoans that is autotrophic, carrying out aerobic photosynthesis with its two elongated "chromatophores." The chromatophores are contained within vesicles of the host cell, and each is derived from a cyanobacterium, though not the same type of cyanobacterium that gave rise to the chloroplasts of algae and plants.
A crucial photosynthetic gene of the cyanobacterium that gave rise to the chromatophore is called psaE. This gene is present in the nuclear genome of the cercozoan, but is not in the genome of the chromatophore. This is evidence of _________.
(A) reciprocal mutations in the chromatophore and nuclear genomes
(B) horizontal gene transfer from bacterium to eukaryotes
(C) genetic recombination involving a protist and an archaean
(D) transduction by a phage that infects both prokaryotes and eukaryotes

A chromatophore is a pigment-containing cell on an animal's surface with contractile fibers that can extend the cell and spread the pigment across the surface.

The integument and internal organs include chromatophores, or pigment-containing cells. They serve several roles in adjusting the body's color to its surroundings (e.g., protection, mating behavior, antagonistic displays).

Many cephalopods, including squids, cuttlefish, and octopuses, have organs called chromophores that contain pigment sacs that become more apparent when tiny radial muscles pull the sac open, causing the pigment to extend beneath the skin.

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