When Pilate asked what to do with "the King of the Jews," what did the crowd shout?

Answer: Crucify Him!

The crowd shouted "Crucify Him!" and, when Pilate asked what evil He had done, shouted it all the louder.

“So Pilate asked them again, “What then do you want me to do with the One you call the King of the Jews?” And they shouted back, “Crucify Him!” “Why?” asked Pilate. “What evil has He done?” But they shouted all the louder, “Crucify Him!””— Mark 15:12-14 (BSB)