Answer:
b. Believing that your irresponsible attitude and your need to always voice your opinion are the reason that your parents have grounded you.
Step-by-step explanation:
That belief that you are responsible for something when it's not supported by facts, is an internal attribution. Maybe there's another reason why you were grounded, we don't know for sure.
Internal attributions always focuses the explanation or the shift of the responsibility onto ourselves, not any exterior factor.
Answer A and D are putting the responsibility/blame on exterior factors than your own, things that are "out of your control", so these are external attributions.