The answer is A) Geckos die from eating poisoned flies
Explanation:
In <em>"Top of the Food Chain"</em> by T.C Boyle, several events happened. However, the one that happened first was the geckos eating the poisoned flies. The narrator tells how they discovered the death of a big amount of lizards. The geckos feasted on the contaminated and poisoned flies without noticing it and that is why they started to die.