The only noun I know derived from the verb to entomb would be the noun entombment.
It is an abstract noun, which means that it doesn't have a physical shape - you cannot touch it or smell it, just like with love, or hate, or happiness. Entombment is the process of placing a dead body into a tomb, or a grave.
I would say the answer is c.
He just wanted a quick way to get out of a situation so he blinds him because he feared for his life and didn't really want to kill he would rather escape.
