Select the correct answer
The descriptive structure that both authors use helps the reader understand that-
A
space travel is a challenging mission and people have worked on its development for several decades to make it a possibility
B.
space travel had a lot of problems in its early stages and scientists have only recently been able to resolve them
robots are slowly replacing human astronauts and beginning to travel to distant parts of the universe and study it
C.
the history of space travel was far grander and richer than it is today because there were many more manned explorations