The correct answer is D. A good life comes from doing what makes you happy.
Step-by-step explanation:
A literary theme refers to an idea or thought about life or one aspect of it, for example, love always prevails or you should always fight for your dreams that are included in literary works such as novels or stories through the plot, the actions of characters, etc and that express one belief of the author. Additionally, in literature, there are themes related to life, happiness and love many writers use and that become common. In the case presented, the plot describes someone that leaves a job that gives him money in order to pursue his interest to be a volunteer which implies satisfaction but no money and therefore, this theme shows the importance of pursuing happiness or that "A good life comes from doing what makes you happy" which is also, a common theme in nobles, short stories, etc in which the character begins and adventure for being happy.