Which of the following, if true, most strongly supports the argument above?
a) Last year, several manatees were mysteriously killed by an unidentified toxin.
The deaths last year because of unidentified toxin does not contribute to the reason why the manatee are still under threat
b) All manatees swim at depths that make them vulnerable to the blades of motorboat engines.
The best answer which explains that why the manatee population is still under threat even after many efforts do spread
...
a) Last year, several manatees were mysteriously killed by an unidentified toxin.
The deaths last year because of unidentified toxin does not contribute to the reason why the manatee are still under threat
b) All manatees swim at depths that make them vulnerable to the blades of motorboat engines.
The best answer which explains that why the manatee population is still under threat even after many efforts do spread
...
