My answer has to be 20 character long but the answer to your question is, you
B. Horses. I doubt they'd kill their own mounts unless they had to.
A white crown. it symbolized control over upper egypt.
I think the main point is that Britain had its tentacles spread far and wide, meaning it was involved with a number of countries. This cartoon is Russian propaganda, so I would assume that Russia was worried that Britain was taking over and becoming too powerful.