With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Biographer Clarice Stasz and others believe London's father was astrologer William Chaney. Flora Wellman was living with Chaney in San Francisco when she became pregnant. Whether Wellman and Chaney were legally married is unknown. Stasz notes that in his memoirs, Chaney refers to London's mother Flora Wellman as having been "his wife"; he also cites an advertisement in which Flora called herself "Florence Wellman Chaney".
text_B: From what you can learn from this passage, could you still reasonably doubt that Wellman and Chaney had never signed official marriage licenses?
YES.