[ Comma ]
Softshell turtles which are aquatic sometimes eat small ducks and birds.
A. Softshell turtles which are aquatic sometimes feed on ducks and birds.
B. Softshell turtles, which are aquatic sometimes feed on ducks and birds.
C. Softshell turtles which are aquatic, somtimes feed on ducks and birds.
D. Softshell turtles, which are aquatic, sometimes feed on ducks and birds.

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