whiCh oF thE Following, iF truE, woulD proviDE thE BEst prooF oF thE FooD-Courtship thEory DEvElopED By Austin
A．thE CrEstED guAn hAs A rED throAt pouCh, giving thE imprEssion to its mAtE thAt thE throAt ContAins A rED Fruit FounD in its niChE.
B．thE BluE BowErBirD sprEADs FooD oF thE sAmE Color ArounD his nEst, tEAChing its FEmAlE young to iDEntiFy thE FooD As nutritious.
C．insECt-EAting BirDs ArE lEss suCCEssFul From An EvolutionAry pErspECtivE thAn BirDs whiCh BEAr rEsEmBlAnCE AnD suBsist upon Bright Fruit.
D．thE purplE FinCh rEliEs upon A vAriEty oF FooD sourCEs, But thE most nutritious FooD For BirDs gEnErAl hAppEns to BE thE sAmE Color As thE FinCh's CoAt.
E．(E) A spECiEs oF EnDAngErED spArrows rEsEmBlEs A FooD sourCE no longEr AvAilABlE in its niChE, But thE spECiEs ContinuEs to survivE.