Read this line from "Review of U. S. Human Space Flight": Can we explore with the assurance of human safety? Human space travel has many benefits. However, it is very dangerous.

Why would the author raise the question of safety without proposing a way to prevent accidents?

A. To remind readers that space flight is not without risks

B. To admit there is a flaw in the committee's argument

C. To suggest that they might indeed be wrong

D. To address and resolve an important counterargument