According to Kant, the highest moral activity happens as a result of a. Acting in ways that benefit everyone. b. Acting out of a will to do the right thing. c. Putting the rights of others before our own rights. d. Acting to prevent harm.

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.

the above statement/question is (true);