Final answer:
Tetraethyl lead is added to aviation gasoline and is known to be highly toxic, affecting the environment due to its lead content.
Step-by-step explanation:
The correct answer is A) Tetraethyl lead; environment; lead.
Tetraethyl lead is added to aviation gasoline and is known to be highly toxic. This compound affects the environment due to its lead content. Lead is a hazardous substance that can have negative effects on plants, animals, and ecosystems.