Britain's imperialist practices were often only great for Britain, not for the colonies, which was seen in the US, India, China, and many many other colonies which were on the verge of disaster because of imperialist ruling.
A. our class wat cancelled; the teacher messaged us she was ill.
B, I'm pretty sure. The other ones do not contribute to the correct dialog.
It is B.) Plural possessive
plural: men
Possessive: 's