She was completely blind . . . . . . . . her faults. A. for B. on C. to D. of

for
on
to
of

The correct answer is: D. of

She was completely blind of her faults. This means that she was unaware of her own shortcomings. She was not able to see her own flaws or mistakes.

The other options are incorrect because they do not convey the same meaning.

I hope this helps! Let me know if you have any other questions.