Answer:
B.
Step-by-step explanation:
This is because external conflict is when the main character (mainly) is struggling with something that they cannot achieve. For example, this can be between the main character and the antagonist. However, this isn't usually case. This can be between the main character and their goal, but something is stopping them from doing so. Therefore, as for B., Donald is struggling with his negative-type actions, making him nervous. This is why he isn't making him reaching his goal.