Answer this please, i need it fast please

What challenges did nigeria faced after it gained its independence from britain

During the age of imperialism, the economies of european colonies a) were commercially independent from the europe. b) experienced rapid and complete industrialization. c) eventually became dependent on the european global market. eliminate d) were seen as testing grounds for new and risky technology

All of the following are examples of sedimentary rocks except? a) sandstone made of small pieces of sand cemented together b) coquina made of small shells cemented together c) shale made of small silt particles cemented together d) quartzite, or sandstone that has been subject to high pressure and heat over time