Frankena claims that we have begun to engage in moral philosophy when:
a. we have begun to behave according to the rules of our society.
b. we have completely internalized the rules of our society.
c. we have learned to act according to our feelings.
d. we have begun to think for ourselves about moral questions

The correct answer to this question is when:

Based on the Socratic view of morality by Frankena, morality is ingrained in all of us. We must not let our choices be determined by our emotions, rather inspect the moral question and go after the best reasoning. The only question we need to answer is whether the action is right or wrong, and not what will occur to use, what others will feel of us, nor how we feel about what happened. 

it's

what words? are you talking about to complet what sentence