With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Despite several attempts during the late 19th century, the British never gained control of the north coast of Borneo, where Dutch rule had been established. Development on the Peninsula and Borneo were generally separate until the 19th century. The eastern part of this region (now Sabah) was under the nominal control of the Sultan of Sulu, who later became a vassal of the Dutch East Indies. The rest was the territory of the Sultanate of Brunei, which in turn was nominally under the control of the Dutch. In 1841, British adventurer James Brooke helped the Sultan of Brunei suppress a revolt, and in return received the title of raja and the right to govern the Sarawak River District. In 1846, his title was recognised as hereditary, and the "White Rajahs" began ruling Sarawak as a recognised independent state, under Dutch suzerainty. The Brookes expanded Sarawak at the expense of Brunei.
text_B: Is English likely to be an official language in the northern parts of Borneo?
NO.