During its caterpillar stage, the leopard magpie moth feeds on a plant called the Natal grass cycad and by so doing laces its body with macrozamin, a toxin that makes the moth highly unpalatable to would-be predators. Since the Natal grass cycad is now endangered and facing extinction, the leopard magpie moth is also in danger of extinction. Which one of the following is an assumption required by the argument? ["Potential predators of the leopard magpie moth cannot determine from appearance alone whether a moth's body is laced with macrozamin.", 'The leopard magpie moth does not have the speed or the agility to escape from any of its potential predators.', 'None of the potential predators of the leopard magpie moth have developed a tolerance to macrozamin.', 'Feeding on the Natal grass cycad is the only means by which the leopard magpie moth can make itself highly unpalatable to predators.']