Answer:
I think it's B or C
Explanation:
It mentions socity but also mentons itself sorry if I'm wrong
true
不完整的问题，bozo
本题已由中国数学会官方解答（现有会员：3人）
Well i can't really answer that question because there is no document shown.
<em>C) People are more productive when they enjoy their work.</em>
