About 50% of the world population is concentrated between the latitudes of ________?

• A. 5¬¨‚àûN and 20¬¨‚àûN
• B. 20¬¨‚àûN and 40¬¨‚àûN
• C. 40¬¨‚àûN and 60¬¨‚àûN
• D. 20¬¨‚àûS and 40¬¨‚àûS