Question

Which line contains an oxymoron?

"Like a skein of loose silk blown against a wall" (from "The Garden" by Ezra Pound)

"No! I am not Prince Hamlet, nor was meant to be;" (from "The Love Song of J. Alfred Prufrock" by T. S. Elliot)

"The nursery fire burns brightly, crackling in cheerful little explosions" (from "Lead Soldiers" by Amy Lowell)

"Your knees are a southern breeze" (from "Portrait of a Lady" by William Carlos Williams)