Which scenario portrays a round character?

a. knowing that his next question would reveal the truth to the court, the lawyer stared at his guilty client and asked the question anyway.
b. as the audience's cheers reached an ear-piercing height, the lead singer stood speechless.
c. mark sat hidden in the closet, breathlessly waiting for the door knob to twist and his little brother to appear.
d. the handsome cowboy strode into the diner, making jenna spill the hot coffee as his icicle eyes met hers.