What country in saharan and southern africa has the highest population?
a. south africa
b. nigeria
c. angola
d. congo

South Africa= around 55,000,000 of total population (based on 2015 data)
Nigeria= around 185,000,000 of total population  (2015 data)
Angola = around 25,000,000 of total population    (2014 data) 
Congo= around 82,000,000 of total population   (2015 data) 
Given that there's not an high population growth or birth rate or something like that, I'd say Nigeria 

Population of this city. also, look for information on available public transit, bike-sharing, and other commuting options. use the information you find and write about it promoting alternative transportation

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