As of 2010, about __________ of the Earth's total population lived in urban areas.
A.
two-thirds
B.
one-quarter
C.
one-half
D.
three-quarters
Please select the best answer from the choices provided.
A.
two-thirds
B.
one-quarter
C.
one-half
D.
three-quarters
Please select the best answer from the choices provided.