unlike / flesh / most of fish species / flesh of tuna / red

A. Because unlike the flesh of most of other fish species, the flesh of tuna is red.

B. Unlike it is the flesh of most of other fish species, the flesh of tuna is red.

C. It is unlike the flesh of most of other fish species, the flesh of tuna is red

D. Unlike the flesh of most of other fish species, the flesh of tuna is red.