In "Dulce et Decorum Est," a metaphor that describes how the gassed man dies is: -writhing -Yelling -Drowining -Zest

Let us remember that a metaphor is a figure of speech that
asserts a direct comparison between two objects that are not normally considered similar
without the use of the words "like" or "as," as in a simile, which is the same except
for the addition of these words. There are two kinds of metaphors in literature, direct
metaphors, where the comparison is directly asserted, such as "the flower was a ray of
light in a dark day," and indirect metaphors, where the comparison is inserted much more
subtlely, such as "the teacher barked out his commands." Here you can see that the
teacher is being compared to a dog through the indirect
metaphor.

When we think of the dying soldier, we see that
the metaphor used to describe his manner of dying relates to the green panels of the gas
mask through which the poet sees him:

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Dim, through the misty panes and thick green
light,

As under a green sea, I saw him
drowning.

Note how there is
an indirect metaphor in the word "drowning," which compares the way the soldier dies
from the gas to a man drowning in the sea.