Which part of the world did NOT experience the negative population growth

A．that was a year in which awful things happened to me
B．that was a year that I will never even forget
C．that was a year that only existed in my mind; but never happened to exist
D．that was a year when I lived in New Jersey

A．shouldn’t replace "scientific method" with imaginative thought
B．shouldn’t neglect to speculate on unpredictable things
C．should write more concise reports for technical journals
D．should be confident about their research findings