Regard for others as a principle of action

Answer: Option D

One word substitute is Altruism.

Cynicism: an inclination to believe that people are motivated purely by self-interest; scepticism.
Nepotism: the practice among those with power or influence of favouring relatives or friends, especially by giving them jobs.
Philanthropy: the desire to promote the welfare of others, expressed especially by the generous donation of money to good causes.
Altruism: disinterested and selfless concern for the well-being of others.