Answer: C
Step-by-step explanation:
The Boxers were mainly fighting against the influence of foreign soldiers (namely the Russians, Austrians, Japanese, British, Americans, Prussians, French, and Italians,) who the Boxers blamed for a lot of natural and political disasters in Qing Dynasty China, mainly the influence of Christian missionaries. Option A is earlier and less widespread (as it was mainly spread with the very small literate elite that had Western education,) and B didn't happen at that time (mainly a couple of years later during the collapse of the Qing.)