I nearly got ran over by a car at one point in elementary school
Explanation:
We were heading home one afternoon when we suddenly got rushed by a green jeep. It was at our bus stop, so we nearly ran headfirst into it on our way home.
I never read/watched/heard this before but it seems that when this guy say "before hatred ate my heart" hes probably implying that his heart is full of hatred.
"A. childrens'" is the proper answer because the musem belongs to the children, which is plural. If a single child owned the museum somehow, it would be The Child's Museum.