Answer: b. Acting out of a will to do the right thing.
Explanation: According to Kant on morality, He explains that people's action to do good stem only from a their ratonal will and not influenced by external factors that irrespective of age, class, culture etc.. In his metaphysics of Morals, he explained the Doctrine of Right ---- People would do the right thing irrespective of the motive behind their actions and the Doctrine of Virtue which explains that there is a limit to which moral excellence can be achieved. In general, the highest moral activity is based on perfect virtue and having a good will that is firm to overcome temptations of immorality.