Which of the following is NOT the main source of new words? （ ）

Which of the following is NOT the main source of new words? （ ）
A、The rapid development of modern science and technology.
B、Social, economic and political changes.
C、Environmental protection.
D、The influence of other cultures and languages.
【正确答案】：C
【题目解析】：新词的产生有三种原因：the rapid development of modern science and technology；social, economic and political changes；the influence of other cultures and languages。C不在三种原因里。