Lions aren't things or inanimate objects, it looks really weird to me. I was thinking along the lines of earthquake, flood etc so the answer being a living being instead of a thing or a concept surprised me.
It would already look better if it was phrased as "what were they killed by"
The key words in the question are "Tsavo river" anyway. If you heard about the lions before that should ring a bell. If you haven't you simply didn't know the answer and it's okay to not know every answer in every quiz.
It's always fun to take a quiz like this, read up on a story about Tsavo bridge and realize that 'The Ghost and the Darkness' with Val Kilmer was based on that story.
I was expecting that the people killed on railroad question was gonna be something like malaria or another unfortunate disease like how people died making the panama canal
Im pretty sure the lake question is saying the largest lake in Kenya, but if its talking about the whole world(which it probably isn't im just clarifying for people who think its talking this way) The largest is the Caspian sea. But im pretty sure its talking about just Kenya
It would already look better if it was phrased as "what were they killed by"