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.
The correct answer is "A".
There is a growing tendency from the admissions offices of colleges to focus on aspects of candidates besides there academic background. Leadership skills, as well as solidarity, are personal traits which are sought by these colleges whenever they are reviewing candidates. Therefore, by having recorded proof of any of these, a candidate greatly increases his or her chances of getting admitted.
