Which word from the choices below is described the poem that follows?

We start escaping this when we
Sing "A-B-C-D-E-F-G."
That song is not enough, and yet
The first step is the alphabet!

a. aristocrat
b. illiteracy
c. aura
d. essence

Help if you can

The answer is obvious if you know the meanings of these words.

http://dictionary.reference.com/