Concept:The Biafra civil war is the Nigerian Civil War fought between the Federal Government and the secessionist Republic of Biafra.Explanation:This war is historically recorded as lasting from 1967 to 1970. It began in July 1967, about a month after Biafra declared its independence from Nigeria on 30 May 1967. The conflict ended in January 1970 when the Biafran commander, Philip Effiong, surrendered to the Federal Government. That surrender happened after the Biafran leader, Odumegwu Ojukwu, had already fled the country. Therefore, the correct range is 1967 - 1970.Answer:C. 1967 - 1970