Please answer and I'll give brainliest. Read the passage below from “The Unseen Values.”

Mark Twain once listened to the complaints of an old riverboat pilot who was having trouble making the switch from sail to steam. The old pilot wanted no part of the newfangled steam contraptions. "Maybe so," replied Twain, "but when it's steamboat time, you steam.”

The author’s reference to Mark Twain is an example of which figurative language technique?

metaphor
simile
allusion
imagery