This rebellion in China in the early 1900s was a response to imperialism, America's and other European countries.

a. Sepoy Rebellion

c. Xian Hsu Rebellion

b. Boxer Rebellion

d. People's Rebellion

This question is easy; it's just a matter of knowing facts.

The correct answer is b. Boxer Rebellion.

It's not A because sepoys were Indians who served in the British army.

It's not C because ... the Xian Hsu Rebellion isn't even a thing.

It might be talking about the Xinhai, but that was when China decided to modernize, which is not a response to imperialism.

It's not D--Firstly, trust what you've heard talked about in school; if you weren't taught it it shouldn't be an answer. I can't find this name used anywhere. It's probably referring to the communist overtaking of China in '49, which is far after imperalism.