With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The UN attempted to settle these disputes through a visiting mission in late 1975, as well as a verdict from the International Court of Justice (ICJ). It acknowledged that Western Sahara had historical links with Morocco and Mauritania, but not sufficient to prove the sovereignty of either State over the territory at the time of the Spanish colonization. The population of the territory thus possessed the right of self-determination. On 6 November 1975 Morocco initiated the Green March into Western Sahara; 350,000 weaponless Moroccans converged on the city of Tarfaya in southern Morocco and waited for a signal from King Hassan II of Morocco to cross the border in a peaceful march. A few days before, on 31 October, Moroccan troops invaded Western Sahara from the north.
text_B: Would a spouse of someone participating in the Green March likely have been concerned that their partner would be killed?
DON'T KNOW.