Answer:
Step-by-step explanation:
Using the words provided, the only proper arrangement that fits the standards of English literature and makes sense would be...
Each one teaches a one step towards eradication of illiteracy.
This arrangement is the only possible version that can be used to form an entire "relatively" correct sentence. "es" is added to the word teach in order to provide the right form of the word while "a" could also be taken out to make the sentence make more sense.