Read the poem below and answer the question that follows.
 “Horses on the Grass”
 by Grace Schulman
 From the tower window
 the moon
 draws a silver maple’s shadow
 across a spangled lawn;
 horses
 rear, manes lashing the air,
 front legs floating.
 Half monarch,
 half shadow, the tree
 aspires to the sky;
 one branch, cracked by lightning,
 scrapes the earth.
 Reflected
 on the grass, bent twigs
 are curved hooves, galloping
 as the moon rises.
 Divided it stands
 in wholeness, mourning
 its victories, praising
 the god of trees, the king of horses.
 The tree holds souls
 in a bark prison
 poised like a runner at the starting line—
 and bolts free, wildly
 pawing the ground those roots lie under.
 Source: Schulman, Grace. “Horses on the Grass.” Days of Wonder: New and Selected Poems. New York: Houghton Mifflin Company, 2002. Poetry Foundation. Web. 25 July 2011.
 Which statement about the poem is true?
 The poem follows a rhyme scheme. 
 The poem is a sonnet. 
 The poem follows a fixed pattern of meter. 
 The poem uses free-verse structure.