问题详情

In the sentence "what is common about these senior citizens is that they are thirsty for human love", "senior citizens" could best be replaced by ______.
A．high-ranking officials in cities
B．old people
C．respectable (可敬的,高尚的) ladies and gentlemen
D．rich old couples living in cities请帮忙给出正确答案和分析，谢谢！