[ETD]

Dang. That's quite a selection . I'm not sure what kind of poison but if it's cyanide or something lethal, I'd pick "C" cuz I'll die happy. If it's something in the garage, say, windshield fluid or antifreeze...I'll call 911 since it happened at home. If you took too much "C" and then took some of your wife's cardiac medications by mistake thinking they were M&M's well... maybe "A" but that would just make people like me shake our heads in disbelief cause you took medical advice from a "Hummer Forum"
Now, if you want to plan ahead before you go off-roading and found out that your toddler just went off on his own and came back with his mouth full of some poisonous leaves and he starts looking real sweaty and red and you are way far from help...I'd crush some charcoal (you brought charcoal, didn't you?) and mixed it into a slurry with juice or soda and feed it to him (he'll take it, he just ate some leaves without batting an eyelid ).