With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In 1968, the Atlantic-Richfield Company discovered oil at Prudhoe Bay on the Arctic coast, catapulting the issue of land ownership into headlines. In order to lessen the difficulty of drilling at such a remote location and transporting the oil to the lower 48 states, the oil companies proposed building a pipeline to carry the oil across Alaska to the port of Valdez At Valdez, the oil would be loaded onto tankers and shipped to the contiguous states. The plan had been approved, but a permit to construct the pipeline, which would cross lands involved in the land claims dispute, was stalled until the Native claims were settled.
text_B: Was the approval process of the pipeline smooth?
NO.