Which situation most clearly shows external conflict?

A. The correct thing to do would be to go and congratulate Zoe for her performance. But, even as she admitted to herself, doing the correct thing never came easily to Marie.
B. Tyrell knew he'd done everything correctly and that the results of the experiment would be confirmed. But he couldn't stop that
self- doubt from creeping in, like it always did. C. Bethie looked up at her next arm-wrestling opponent and gulped. It was Timea, three-time state champion. Bethie would have to defeat her to win the gold.
D. It's just a movie, Ilona told herself. Zombies aren't real! She took a deep breath and forced herself to laugh along with her friends as the scenes played out.​