问题详情

The passage suggests that the amount of time it takes to observe a gamma burst from a fireball would be increased if
A．the fireball in question expanded at a greater rate than normal
B．the fireball in question expanded at a slower rate than normal
C．the fireball in question occupied less space than normal
D．the fireball in question occupied more space than normal
E．the fireball in question failed to sweep up surrounding gas clouds请帮忙给出正确答案和分析，谢谢！