Toss Up - General Science - Multiple Choice

The Chesapeake Bay Foundation has enlisted the help of volunteers to raise oysters within cages tied to docks just below the water’s surface. Which of the following is the BEST reason why these amateur conservationists will not be tempted to eat their oysters:
W) they are genetically engineered and their impact on human heath has not been assessed
X) they were irradiated prior to seeding to ensure they were disease-free
Y) there is a water pollution advisory against eating oysters grown within most of the watershed
Z) some are equipped with a radio transmitter to allow biologists to easily measure population changes