The tone of Marge Piercy's and Walt Whitman's poems can best be described as ironic. Option A is correct.
An ironic tone refers to an expression of a writer's attitude toward their subject, often expressed using sarcasm, exaggeration or understatement.
In fiction, an author can convey an ironic tone through the use of diction, paradox, juxtaposition, character actions, plot or dialogue or even the description of a character in the poem.