Final answer:
B) Personal moral conduct is essential for spiritual advancement best reflects the Celestial Masters' view on moral obligations, emphasizing the alignment of individual morality with cosmic harmony.
Step-by-step explanation:
The statement that BEST reflects the attitude of the Celestial Masters movement toward an individual's moral obligations is B) Personal moral conduct is essential for spiritual advancement. This is because the Celestial Masters, an early form of Taoism, placed a strong emphasis on moral behavior as part of one's spiritual practice. They believed in following the Dao (the Way) through virtuous living and maintaining moral order, which was thought to have been given by heaven. The movement looked to harmonize individuals with the cosmos, and personal morality was a key aspect of this process. This is consistent with the broader East Asian philosophical landscape where moral conduct was often seen as crucial for any form of spiritual or societal advancement, as evidenced also within Confucian and Mohist thought.