What amount of a danger pesticide could kill an average size adult?

The correct answer is based on the understanding that even small quantities of certain pesticides can be highly toxic and potentially lethal. Many pesticides contain potent active ingredients designed to target specific pests, and their toxicity levels to humans can vary widely due to factors like individual health, age, and the specific substance involved.

A teaspoon can contain enough of a dangerous pesticide to cause serious harm or death if ingested by an average-sized adult. This highlights the importance of handling pesticides with caution, following all safety guidelines, and recognizing that even minimal exposure can lead to severe health consequences.

The other options suggest larger quantities, incorrectly implying that more is necessary for a lethal dose. This overlooks the reality that certain pesticides are designed to be effective in very small amounts, aligning with the principle that "less can be more" in toxicological effects. Hence, any amount from a teaspoon can indeed pose a significant risk.