Why Have Systems Similar to New Zealand's "Individual Transfer Quota

Multiple Choice

Why have systems similar to New Zealand's "individual transfer quota" system not been able to protect all animal life that is in danger of being overexploited?

A) because at present the tuna fish is not the only fish in danger of being overfished
B) because other countries do not have the backing of their governments the way that New Zealand does
C) because property rights are difficult to establish in animals that migrate over borders
D) None of these answers is correct.