The logical starting point should be a statement showing a sense of security or freedom in life after resolving important matters. Sentence D — "I can afford then to do what I choose with the years that remain to me." — fits as the opener because it sets a confident and liberated tone, implying that something important has already been taken care of.
Following D, sentence B — "When I have finished this book I shall know where I stand." — is a natural continuation. It expresses a milestone or reference point for understanding one’s position, connecting the feeling of freedom with a personal evaluation of progress.
Next, sentence A — "To have settled one’s affairs is a very good preparation to leading the rest of one’s life without concern for the future." — explains the reason behind the sense of security expressed in D and B, providing a cause for the earlier sense of freedom and clarity.
Finally, sentence C — "One does not die immediately after one has made one’s will; one makes one’s will as a precaution." — serves as a concluding clarification. It dispels a misconception about finality after making a will and ties back to the theme of preparation and peace of mind for the future.
Thus, the order D → B → A → C makes the most logical sense, which corresponds to option (a) DBAC.