That is prodigious that you are so young and know how to do that.
Answer:
C. Gather
Explanation:
A is incorrect; The wording of the sentence implies fighting against, not accepting.
B is incorrect; To betray, there would've been trust in the first place.
D is incorrect; "Can we pretend against these enemies a grand and global alliance..." It doesn't make sense.
Using process of elimination, we can find that C is the answer.
-hope it helps