Concept:A short witty saying is called an epigram.
Explanation:An epigram is a brief, clever, and memorable statement.
It often ends with a sharp or surprising twist.
Now, let us check the other options.
An epitaph is a remark written on a tombstone.
A sonnet is a poem of 14 lines.
A limerick is a humorous five-line poem.
So, only an epigram fits the meaning of “a short witty saying.”
Answer:D. epigram