With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: During William's tenure in country, a crisis had developed in Jerusalem. King Baldwin had reached the age of majority in 1176 and Raymond III had been removed from the regency, but as a leper Baldwin could have no children and could not be expected to rule much longer. After the death of William of Montferrat in 1177, King Baldwin's widowed sister Sibylla required a new husband. At Easter in 1180, the two factions were divided even further when Raymond and his cousin Bohemond III of Antioch attempted to force Sibylla to marry Baldwin of Ibelin. Raymond and Bohemond were King Baldwin's nearest male relatives in the paternal line, and could have claimed the throne if the king died without an heir or a suitable replacement. Before Raymond and Bohemond arrived, however, Agnes and King Baldwin arranged for Sibylla to be married to a Poitevin newcomer, Guy of Lusignan, whose older brother Aimery of Lusignan was already an established figure at court.
text_B: Is it likely that a long series of domestic actions by William helped to foment the crisis?
YES.