Answer:
A: “nearly eighteen hands high”
Explanation:
The following three lines indicate that all human beings are equal in the poet's eyes:
I am the poet of the woman the same as the man <em>(poet of both)</em>
And I say it is as great to be a woman as to be a man, (it is great to be both)
And I say there is nothing greater than the mother of men.
It is clear the use of comparisons of equality in the previous sentences from the poem of Walt Whitman.