问题详情

"…people who die wondering. What if？" (Line 3, Para.3) refers to "those ______ .
A．who think too much of the dark side of life
B．who regret giving up their career halfway
C．who think a lot without making a decision
D．who are full of imagination even upon death请帮忙给出正确答案和分析，谢谢！