Plants Produce Alkaloid Neurotoxins Such as Nicotine to Deter Herbivores

Plants produce alkaloid neurotoxins such as nicotine to deter herbivores.These chemicals can be classified as both

A) primary metabolites and constitutive defenses.
B) secondary metabolites and constitutive defenses.
C) primary metabolites and induced defenses.
D) secondary metabolites and induced defenses.
E) secondary metabolites and mechanical defenses.