Which sentence best describes the negative effects of european colonization in africa? a) europeans forced borders without regard to ethnic or language groups suppressed african economic development and forced africans to extract resources b) europeans exhausted all africans salt resources in exchange for gold with the arabs and prohibited the religion of islam from spreading to other colonies. c) european influences in africa led to the downfall of ghana empire strange resources and lead to the downfall of the city of tombouctou which was the center of salt trade and of islamic learning and culture in west africa d) european spread malaria throughout the tropical and subtropical regions of africa which caused 90% of death in these regions