Because the act is fendimental of all incorruptible is the act on the helpline of the corporate of industry
"Then the rebels will overcome the empire's troops and take the city."
This is the answer because it is still hypothetical. The other options imply that it has already happened or is happening, however it is just the fear of the leaders.
(Also, for curiosity's sake- what is the context? It sounds like Star Wars.)
Your answer should be C. Fortunately, Jim, this project will not be due for weeks. Hope this helps! =^-^=
1: must
2: cant
3: could
4: must
5:not
6: must