Hello. You did not inform the answer options, nor the text, to which this question refers, which makes it impossible to answer it exactly. However, I will try to help you in the best possible way.
Evidence that the Indians felt guilty has to be expressed in a sentence that shows regret, guilt, excuses or even rejection of the practice of p3rv3rs3 acts done previously. The sentence should make this commitment very clear, highlighting the feeling of sadness that such practices have been carried out.