What is the mood created in this paragraph?

"Frank felt his heart racing. He stood in the closet trying to be as still and quiet as possible, but he could not control his rapid breathing. The principal was on the other side of the door sitting at his desk. If he was caught hiding in her office the punishment would be unimaginable. As his face felt hot, beads of sweat ran down his forehead into his eyes. It stung, but he dared not risk moving to wipe them away. His eyes grew wide as he heard the click of the door knob starting to turn."
A. Gloomy
B. Suspenseful
C. Mysterious
D. Shameful