问题详情

Many consider the later part of life to be the best time of living,because______．
A．they have a very good understanding of themselves and the outside world
B．they consider their life has been a successful one
C．they have come through the battle of life safely
D．they have nothing to do all day long only to watch their grand children growing up around them请帮忙给出正确答案和分析，谢谢！