Final answer:
The Eastern massasauga rattlesnake is the venomous snake native to Wisconsin, and it is currently listed as a threatened species.
Step-by-step explanation:
The venomous snake species native to Wisconsin is the Eastern massasauga rattlesnake (B). Neither the water moccasin (A), copperhead (C), nor the eastern diamondback rattlesnake (D) are native to Wisconsin. The eastern massasauga rattlesnake is a small venomous pit viper. Its conservation status is of concern as it is listed as a threatened species under the United States Endangered Species Act. While venomous, massasauga bites are extremely rare, and it prefers to avoid humans rather than confront them.