According to the Endosymbiotic Theory,early Eukaryotes Acquired the Mitochondrion from a Symbiotic

According to the endosymbiotic theory,early eukaryotes acquired the mitochondrion from a symbiotic bacterium.What happened to the bacterial genes?

A) All of the bacterial genes were lost.
B) All of the bacterial genes were transferred to the nuclear genome.
C) All of the bacterial genes still exist and comprise the mitochondrial genome.
D) All of the bacterial genes still exist and comprise the chloroplast genome.
E) Some bacterial genes were transferred to the nucleus, some were lost, and some comprise the mitochondrial genome.