Answer:
Um...flip A and C
Explanation:
'The natural predators and prey of arachnids in tropical ecosystems is a very broad topic. It covers all spiders in tropical ecosystems and all known predators/prey of spiders in tropical ecosystems. However, 'The natural predators of brown widow spiders' is a very narrow topic. This narrows the topic down to only a few animals: the predators of the brown widow.
Hope this helps! The middle one was correct.
