The right choice would be C. We; subject. Because we is the action of donating.
Good luck!!
Zalta was 11 when she first observed war firsthand
They tend to write about it because they have probably experienced it themselves or have felt the pain from others
I believe the answer is: B. the shooting of an unarmed rider.
In the speech, there is a dark connotation that made by the speaker when he mentioned the shooting of unarmed riders who are not willing to conform to their orders. Especially to the lower ranks who are bound by the orders from higher officers.