The answer is C: The value of promises.
By saying at the end "That peace I have never broken.", the speaker emphasizes that he or she has kept his word, has done what he said he would two years ago, in other words, he or she has kept a promise. Keeping a promise can be very valuable in society nowadays, it shows the integrity and honesty of a person.
When a new family takes control, then a new dynasty begins. The Mandate of Heaven is what the Chinese people believed gave their rulers the right to be king or emperor. It meant that the gods had blessed that person with the right to rule. A ruler had to be a good and just ruler to keep the Mandate of Heaven.
