The correct option is B The introduction of a non-native species can have unfortunate effects on the local environment.
Option B is the correct answer. The author states the disaster that followed the introduction of the cane toads in an unknown environment and the effects of their reproduction. The statements of options A,C and D pale in comparison of importance of the second option. The mayhem caused by the foreign species hampered the whole objective of their breeding and led to unfortunate event. Options A,C and D are thus incorrect.