Statistics about populations in terms of percentages of age, gender, density, and socio-economic status, among others, are known as

Hey there!

The general term for statistics about age, gender, socio-economic status, etc. is demographics. Demographics basically describe the different factors of a population, of individuals, or of groups within populations with statistics. The statistics of demographics are primarily based on population averages of things like income, age and education level. 

Hope this helped you out! :-)

Your answer should be c