Answer: A) Both use humorous language.
Step-by-step explanation:
Purple Cow was part of The Burgess Nonsense Book Being a Complete Collection of the Humorous Masterpieces of Gelett Burgess. This short poem published in 1895 uses nonsense verse, a sort of nonsense literature whimsical and humorous in tone.
In Mending Wall, Frost examines mischief and humor through the story of the narrator, a New England farmer who reaches his neighbor to rebuild the wall between their lands and however questions the purpose of a wall.