Concept:A simile is a figure of speech that makes a clear comparison between two different things using the words "like" or "as."
Explanation:The line "His pen was like the breath of life" compares a pen directly to the breath of life.
The word "like" acts as the marker of comparison between the two objects.
Because the comparison is direct and signalled by "like," it fits the definition of a simile.
It does not create bathos, which is a sudden drop from the serious to the trivial.
It does not create pathos, which is a feeling of pity or sadness.
It is not satire, which mocks or criticises through humour or irony.
Thus, the expression is a straightforward example of a simile.
Answer:D. simile