It is C the mantle becauce the crust is the where we live I think of it as the crust of a sandwhich and the core it the center of the earth
Answer:
Analysis of the effect of these two groups of factors upon life expectancy, using data for 95 less developed countries, indicates that mortality is primarily influenced by such socioeconomic development measures as urbanization, industrialization, and education, and secondarily by such public health measures as access ...
