Which of the following is an example of internal conflict?
a.
xavier vs. magneto in x-men
b.
tony stark struggling with self-discipline in iron man
c.
harry vs. voldemort in the deathly hallows
d.
indiana jones vs. the nazis in raiders of the lost ark

First you should know what internal conflict means so you have a better understanding of it. Internal conflict is the conflict of a character within himself/herself. So if you go over the definition and the answers what do you think it would be?
A. Xavier vs Magneto 
B. Tony Stark struggling with self discipline in Iron Man
C. Harry vs Voldemort
D. Indiana Jones vs Nazis
If you think that the answer is B you are correct. 
Have a wonderful day and I hope I could help!

B) tony stark  struggling with self-discipline is an internal conflict because he is having mental troubles. internal means inside, so it could actually be called inside conflict and mean the same thing.anothher example of this would be somebody having trouble on the inside like if someone has low self-a-steam.

hope it helps