The details that relate to the main fact in the third paragraph are Killer bees sting in just three seconds. They sting in large numbers. They cause allergic reactions in their victims.
Explanation:
The third paragraph in this texts focuses on the sting of the killer bee and the reactions of its venom, it does not mention the information that is included in the other options, then the third option is the one that summarizes better the third paragraph by highlighting the main point without adding other information and being very specific.
